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<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#access-control-lists">Access Control Lists</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#working-with-acls">Working with ACLs</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#sample-acl">Sample ACL</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#access-rights">Access Rights</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#access-control-defaults">Access Control Defaults</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#access-control-identifier-aci">Access Control Identifier (ACI)</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#negative-rights">Negative Rights</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#calculating-a-users-rights">Calculating a Users’ Rights</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#login-authentication">Login Authentication</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#anonymous-login">Anonymous Login</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#plaintext-authentication">Plaintext Authentication</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#kerberos-logins">Kerberos Logins</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#shared-secrets-logins">Shared Secrets Logins</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#quotas">Quotas</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#working-with-quotas">Working with Quotas</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#monitor-and-repair">Monitor and Repair</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#supported-quota-types">Supported Quota Types</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#quota-roots">Quota Roots</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#controlling-quota-behavior">Controlling Quota Behavior</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#mail-delivery-behavior">Mail Delivery Behavior</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#quota-warnings-upon-select-when-user-has-d-rights">Quota Warnings Upon Select When User Has <code class="docutils literal notranslate"><span class="pre">d</span></code> Rights</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#quotas-and-partitions">Quotas and Partitions</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#new-mail-notification">New Mail Notification</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#partitions">Partitions</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#specifying-partitions-with-create">Specifying Partitions with “create”</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#changing-partitions-with-rename">Changing Partitions with “rename”</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#news">News</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#pop3-server">POP3 Server</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#the-syslog-facility">The syslog facility</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#mail-directory-recovery">Mail Directory Recovery</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#reconstructing-mailbox-directories">Reconstructing Mailbox Directories</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#reconstructing-the-mailboxes-file">Reconstructing the Mailboxes File</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#reconstructing-quota-roots">Reconstructing Quota Roots</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#removing-quota-roots">Removing Quota Roots</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#subscriptions">Subscriptions</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#configuration-directory">Configuration Directory</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#log-directory">Log Directory</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#proc-directory">Proc Directory</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#message-delivery">Message Delivery</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#local-mail-transfer-protocol-lmtp">Local Mail Transfer Protocol (lmtp)</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#single-instance-store">Single Instance Store</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/overview_and_concepts.html#duplicate-delivery-suppression">Duplicate Delivery Suppression</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#sieve-a-mail-filtering-language">Sieve, a Mail Filtering Language</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/overview_and_concepts.html#cyrus-murder-the-imap-aggregator">Cyrus Murder, the IMAP Aggregator</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../../setup.html">Setup</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../developer/compiling.html">Compiling</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer/compiling.html#setting-up-dependencies">Setting up dependencies</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#required-build-dependencies">Required Build Dependencies</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#build-dependencies-for-additional-functionality">Build dependencies for additional functionality</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/compiling.html#compile-cyrus">Compile Cyrus</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#default-build-mail-only">Default build: mail only</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#optional-dependencies">Optional dependencies</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#compile">Compile</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html#check">Check</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../installing.html">Installing Cyrus</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#install-cyrus">Install Cyrus</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#optional-components">Optional Components</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../download/installation/manage-dav.html">HTTP modules</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../download/installation/virus.html">Virus Scanner</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#setting-up-syslog">Setting up syslog</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#create-cyrus-environment">Create Cyrus environment</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#set-up-the-cyrus-mail-user-and-group">Set up the cyrus:mail user and group</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#authentication-with-sasl">Authentication with SASL</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#mail-delivery-from-your-mta">Mail delivery from your MTA</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#protocol-ports">Protocol ports</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#cyrus-config-files">Cyrus config files</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#optional-setting-up-tls-certificates">Optional: Setting up TLS certificates</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html#prepare-ephemeral-run-time-storage-directories">Prepare ephemeral (run-time) storage directories</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#launch-cyrus">Launch Cyrus</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#send-a-test-email">Send a test email</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#checking-carddav-and-caldav">Checking CardDAV and CalDAV</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../installing.html#troubleshooting">Troubleshooting</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../download/upgrade.html">Upgrading to 3.6</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#preparation">1. Preparation</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../download/upgrade.html#versions-to-upgrade-from">Versions to upgrade from</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../download/upgrade.html#installation-from-tarball">Installation from tarball</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../download/upgrade.html#storage-changes">Storage changes</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../download/upgrade.html#how-are-you-planning-on-upgrading">How are you planning on upgrading?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../download/upgrade.html#do-what-as-who">Do What As Who?</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#install-new-3-6-cyrus">2. Install new 3.6 Cyrus</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#shut-down-existing-cyrus">3. Shut down existing Cyrus</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#backup-and-copy-existing-data">4. Backup and Copy existing data</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#copy-config-files-and-update">5. Copy config files and update</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#upgrade-specific-items">6. Upgrade specific items</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#start-new-3-6-cyrus-and-verify">7. Start new 3.6 Cyrus and verify</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#reconstruct-databases-and-cache">8. Reconstruct databases and cache</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#do-you-want-any-new-features">9. Do you want any new features?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#upgrade-complete">10. Upgrade complete</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../download/upgrade.html#special-note-for-murder-configurations">Special note for Murder configurations</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../concepts/deployment.html">Configuration Guide</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html">Deployment Scenarios</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#single-server-deployments">Single Server Deployments</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#multi-server-deployments">Multi Server Deployments</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#cyrus-murder-server-aggregation">Cyrus Murder: Server aggregation</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#the-discrete-murder">The Discrete Murder</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#the-unified-murder">The Unified Murder</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#the-shared-murder">The Shared Murder</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#cyrus-replication">Cyrus Replication</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/deployment_scenarios.html#hosted-environments">Hosted Environments</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/databases.html">Databases</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/databases.html#overview">Overview</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/databases.html#file-list">File list</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/databases.html#storage-types">Storage types</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html">Mailbox Creation Distribution</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#selection-mode">Selection Mode</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#special-cases">Special cases</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#partitions-exclusion">Partitions Exclusion</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#partitions-usage-data-reset">Partitions Usage Data Reset</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#mailbox-creation-distribution-through-murder-frontend">Mailbox Creation Distribution Through <code class="docutils literal notranslate"><span class="pre">murder</span> <span class="pre">frontend</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#backends-exclusion">Backends Exclusion</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/mailbox_creation_distribution.html#backends-usage-data-reset">Backends Usage Data Reset</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/known_protocol_limitations.html">Known Protocol Limitations</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/known_protocol_limitations.html#pop3-and-mailbox-locking">POP3 and Mailbox Locking</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/known_protocol_limitations.html#cyrus-imap-pop3-implementation">Cyrus IMAP POP3 Implementation</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/authentication_and_authorization.html">Authentication and Authorization</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/authentication_and_authorization.html#client-authentication">Client Authentication</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/authentication_and_authorization.html#users-and-mailboxes">Users and Mailboxes</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/performance_recommendations.html">Performance Recommendations</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/performance_recommendations.html#databases-on-temporary-filesystems">Databases on Temporary Filesystems</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/performance_recommendations.html#certificates">Certificates</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/storage.html">Storage Considerations</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#general-notes-on-storage">General Notes on Storage</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#redundancy">Redundancy</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#availability">Availability</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#performance">Performance</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#scalability">Scalability</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#capacity">Capacity</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/storage.html#cost">Cost</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../concepts/deployment/supported-platforms.html">Supported Platforms and System Requirements</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/supported-platforms.html#building-cyrus-imap">Building Cyrus IMAP</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/supported-platforms.html#required-software-components">Required Software Components</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/supported-platforms.html#recommended-software-components">Recommended Software Components</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../concepts/deployment/supported-platforms.html#recommended-software-components-enabled-by-default">Recommended Software Components Enabled by Default</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1 current"><a class="reference internal" href="../../../operations.html">Operations</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../manpages/index.html">Man pages</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../manpages/index.html#configuration-files">(5) Configuration Files</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../manpages/configs/cyrus.conf.html"><strong>cyrus.conf</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/configs/imapd.conf.html"><strong>imapd.conf</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/configs/krb.equiv.html"><strong>krb.equiv</strong></a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../manpages/index.html#system-commands">(8) System Commands</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/arbitron.html"><strong>arbitron</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/backupd.html"><strong>backupd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/chk_cyrus.html"><strong>chk_cyrus</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_backups.html"><strong>ctl_backups</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_conversationsdb.html"><strong>ctl_conversationsdb</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_cyrusdb.html"><strong>ctl_cyrusdb</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_deliver.html"><strong>ctl_deliver</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_mboxlist.html"><strong>ctl_mboxlist</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ctl_zoneinfo.html"><strong>ctl_zoneinfo</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cvt_cyrusdb.html"><strong>cvt_cyrusdb</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cvt_xlist_specialuse.html"><strong>cvt_xlist_specialuse</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_backup.html"><strong>cyr_backup</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_buildinfo.html"><strong>cyr_buildinfo</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_dbtool.html"><strong>cyr_dbtool</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_deny.html"><strong>cyr_deny</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_df.html"><strong>cyr_df</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_expire.html"><strong>cyr_expire</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_info.html"><strong>cyr_info</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_ls.html"><strong>cyr_ls</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_synclog.html"><strong>cyr_synclog</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_userseen.html"><strong>cyr_userseen</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyr_virusscan.html"><strong>cyr_virusscan</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyradm.html"><strong>cyradm</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/cyrdump.html"><strong>cyrdump</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/deliver.html"><strong>deliver</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/fetchnews.html"><strong>fetchnews</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/fud.html"><strong>fud</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/httpd.html"><strong>httpd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/idled.html"><strong>idled</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/imapd.html"><strong>imapd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ipurge.html"><strong>ipurge</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/lmtpd.html"><strong>lmtpd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/lmtpproxyd.html"><strong>lmtpproxyd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/masssievec.html"><strong>masssievec</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/master.html"><strong>master</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mbexamine.html"><strong>mbexamine</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mbpath.html"><strong>mbpath</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mbtool.html"><strong>mbtool</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mkimap.html"><strong>mkimap</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mknewsgroups.html"><strong>mknewsgroups</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/mupdate.html"><strong>mupdate</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/nntpd.html"><strong>nntpd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/notifyd.html"><strong>notifyd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/pop3d.html"><strong>pop3d</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/pop3proxyd.html"><strong>pop3proxyd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/promstatsd.html"><strong>promstatsd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/proxyd.html"><strong>proxyd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ptdump.html"><strong>ptdump</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ptexpire.html"><strong>ptexpire</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/ptloader.html"><strong>ptloader</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/quota.html"><strong>quota</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/reconstruct.html"><strong>reconstruct</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/rehash.html"><strong>rehash</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/relocate_by_id.html"><strong>relocate_by_id</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/restore.html"><strong>restore</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/sievec.html"><strong>sievec</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/sieved.html"><strong>sieved</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/smmapd.html"><strong>smmapd</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/squatter.html"><strong>squatter</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/sync_client.html"><strong>sync_client</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/sync_reset.html"><strong>sync_reset</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/sync_server.html"><strong>sync_server</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/timsieved.html"><strong>timsieved</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/tls_prune.html"><strong>tls_prune</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/translatesieve.html"><strong>translatesieve</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/systemcommands/unexpunge.html"><strong>unexpunge</strong></a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../manpages/index.html#user-commands">(1) User Commands</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/arbitronsort.pl.html"><strong>arbitronsort.pl</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/dav_reconstruct.html"><strong>dav_reconstruct</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/httptest.html"><strong>httptest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/imtest.html"><strong>imtest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/installsieve.html"><strong>installsieve</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/lmtptest.html"><strong>lmtptest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/mupdatetest.html"><strong>mupdatetest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/nntptest.html"><strong>nntptest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/pop3test.html"><strong>pop3test</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/sieveshell.html"><strong>sieveshell</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/sivtest.html"><strong>sivtest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/smtptest.html"><strong>smtptest</strong></a></li>
<li class="toctree-l4"><a class="reference internal" href="../manpages/usercommands/synctest.html"><strong>synctest</strong></a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2 current"><a class="reference internal" href="../admin.html">Administrator Guide</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="../admin.html#architecture">Architecture</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../architecture.html">System Architecture</a></li>
</ul>
</li>
<li class="toctree-l3 current"><a class="reference internal" href="../admin.html#management">Management</a><ul class="current">
<li class="toctree-l4"><a class="reference internal" href="locations.html">File & Directory Locations</a></li>
<li class="toctree-l4"><a class="reference internal" href="ports-sockets.html">Ports and Sockets</a></li>
<li class="toctree-l4"><a class="reference internal" href="access-control.html">Access Control</a></li>
<li class="toctree-l4"><a class="reference internal" href="quotas.html">Quotas</a></li>
<li class="toctree-l4"><a class="reference internal" href="sieve.html">Cyrus Sieve</a></li>
<li class="toctree-l4"><a class="reference internal" href="backups.html">Cyrus Backups</a></li>
<li class="toctree-l4"><a class="reference internal" href="nntp.html">Cyrus NNTP</a></li>
<li class="toctree-l4"><a class="reference internal" href="protlayer.html">Cyrus Prot Layer</a></li>
<li class="toctree-l4"><a class="reference internal" href="sop.html">Standard Operating Procedures</a></li>
<li class="toctree-l4"><a class="reference internal" href="eventsource.html">Cyrus Event Source</a></li>
<li class="toctree-l4"><a class="reference internal" href="monitoring.html">Monitoring</a></li>
<li class="toctree-l4 current"><a class="current reference internal" href="#">Mailbox Distribution</a></li>
<li class="toctree-l4"><a class="reference internal" href="murder/murder.html">Cyrus Murder</a></li>
<li class="toctree-l4"><a class="reference internal" href="nginx-proxy.html">HOWTO: Using an NGINX IMAP Proxy</a></li>
<li class="toctree-l4"><a class="reference internal" href="tweaking.html">Tweaking Cyrus IMAP</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../faq.html">Frequently Asked Questions</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../faq.html#features">Features</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../faqs/feature-database-backend.html">Which database backend should I use for which databases?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/feature-duplicate-delivery.html">Duplicate Delivery Suppression</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../faq.html#installation-problems">Installation Problems</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../faqs/install-compilationerrors.html">Compilation errors about kssl.h and krb5.h on Red Hat Linux/Fedora</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/install-install-help.html">Help! There must be an easier way to get all this going…</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/install-linkerwarnings.html">OpenSSL Version Mismatches</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../faq.html#common-feature-requests">Common Feature Requests</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../faqs/r-murder-ha.html">Does the Cyrus Murder support High Availability configurations?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/r-pop3-logging.html">Can I configure pop3d to log amount and size of messages fetched by user?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/r-publicssharedfolders.html">How can I make CyrusSieve work with public shared folders?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/r-subfolders.html">Can I have subfolders not appear under INBOX?</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../faq.html#common-operational-questions">Common Operational Questions</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-acls.html">How do I view ACLs on a mailbox?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-annotations.html">What annotations are available?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-configdir-tempfs.html">Is it safe to put <configdirectory>/proc and <configdirectory>/lock on a tmpfs filesystem?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-coredump.html">How to enable core dumps</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-delete-mailbox.html">Why can I not delete a mailbox as an admin user?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-deleted-expired-expunged-purged.html">When is What … Deleted, Expired, Expunged or Purged?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-deliverdb-size.html">Why is deliver.db so large?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-freezes.html">I have multiple imapd-SERVICES configured and experience occasional freezes when I try to log in!</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-gdb.html">How to run gdb on Cyrus components</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-mailbox-doesnotexist.html">Cyrus delivers claims that the mailbox does not exist</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-mixedcase.html">Why is mail being rejected with No Mailbox found due to MiXed CaSe incoming e-mail?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-otherdatabases.html">Can I use MySQL (or another SQL database) as the primary mail store?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-pop3slow.html">Why do POP3 connections take so long, but once the connection is established all is well?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-reconstruct.html">Why does reconstruct -m not work?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-sharedfilesystem-gpfs.html">Shared File Systems GPFS for high availability</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-telemetry.html">How to enable telemetry</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-toomanyprocesses.html">The process count keeps growing!</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-unable-join-environment.html">“unable to join environment” error</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/o-vacation-mailfrom.html">Why does Cyrus set the MAIL FROM address of the sender of vacation responses to ‘<>’?</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../faq.html#common-interoperability-problems">Common Interoperability Problems</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../faqs/interop-8bit.html">Why does Cyrus reject 8-bit characters in the headers of my messages?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/interop-barenewlines.html">Why does Cyrus reject messages with “bare newlines”?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/interop-sieve-exim.html">How do I get Cyrus Sieve to play nice with Exim?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../faqs/interop-slow-delivery.html">Why does mail delivery go slow or hang sometimes?</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../../developers.html">Developers</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../../contribute.html">We need your help</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../developer/documentation.html">Contribute docs</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#overview">Overview</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#documentation-tools">Documentation Tools</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#building-the-files">Building the files</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#submitting-updates">Submitting updates</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#using-github-pull-requests">Using GitHub pull requests</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#patches-through-the-mailing-list">Patches through the mailing list</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#special-tags">Special Tags</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#rfc">rfc</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#cyrusman">cyrusman</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#imap-current-stable-version">imap_current_stable_version</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/documentation.html#conventions-man-pages">Conventions: Man Pages</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#synopsis">Synopsis</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/documentation.html#examples">Examples</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../developer.html">Contribute code and tests</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer.html#getting-started">Getting Started</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/process.html">Development Process</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/overview.html">Overview of Cyrus development environment</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/github-guide.html">GitHub guide</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/compiling.html">Compiling</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../installing.html">Installing Cyrus</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/developer-testing.html">Developer Test Environment</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/jmap.html">JMAP support</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer.html#system-files-and-databases">System files and Databases</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/namespaces.html">Namespaces: a developer view</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer.html#resources">Resources</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/libraries.html">Developer Libraries</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer.html#releasing">Releasing</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/releasing.html">Releasing Cyrus IMAP</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/ancient-releasing.html">Releasing new builds of ancient Cyrus IMAP versions</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../developer/cyrusworks.html">Cyrus.Works</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer/cyrusworks.html#about-cyrus-works">About Cyrus Works</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/cyrusworks.html#how-it-works">How it works</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../../developers.html#cyrus-internals">Cyrus Internals</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer/API.html">Cyrus APIs</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/API/cyrusdb.html">CyrusDB API</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/API/cyrusdb2.html">cyrusdb API</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/API/index-api.html">Index API</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/API/mailbox-api.html">Mailbox API</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/thoughts.html">Thoughts & Notes</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/backup.html">Notes for backup implementation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/bytecode.html">Cyrus IMAP Server: Sieve Bytecode</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/caldav_scheduling_flowchart.html">Cyrus CalDAV Scheduling Flowchart</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/improved_mboxlist_sort.html">Enabling improved_mboxlist_sort</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/notes.html">Cyrus IMAP Server: Notes</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/thoughts/prot-events.html">Cyrus IMAP Server: Prot Events</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../developer/guidance.html">Guidance for Developers</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/hacking.html">Cyrus IMAP Server: Hacking</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/internationalization.html">Cyrus IMAP Server: Internationalization</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/locking.html">Cyrus IMAP Server: Locking</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/mailbox-format.html">Cyrus IMAP Server: Mailbox File Formats</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/namelocks.html">Cyrus IMAP Server: Namelocks</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/prot.html">Cyrus IMAP Server: prot layer</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/replication_examples.html">Cyrus IMAP Server: Replication Examples</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/replication_protocol.html">Cyrus IMAP Server: Replication Protocol v2.4+</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/special_chars.html">Cyrus IMAP Server: Special Characters</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/guidance/var_directory_structure.html">Cyrus IMAP Server: var directory structure</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../../developers.html#unit-tests">Unit Tests</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../developer/unit-tests.html">Unit Tests</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#table-of-contents">Table of Contents</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#introduction">1. Introduction</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#what-is-a-unit-test">2. What Is A Unit Test?</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#running-the-tests">3. Running The Tests</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#debugging-a-test">3.6 Debugging A Test</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../developer/unit-tests.html#adding-your-own-tests">4. Adding Your Own Tests</a></li>
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<div class="section" id="mailbox-distribution">
<h1>Mailbox Distribution<a class="headerlink" href="#mailbox-distribution" title="Permalink to this headline">¶</a></h1>
<p>In a Cyrus IMAP Murder, the backend server and/or partition on which a new mailbox is created, when created through a Cyrus IMAP Murder frontend, is traditionally selected by querying each of the configured backends (<strong>serverlist</strong> setting in <a class="reference internal" href="../manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a> on the Murder frontend) for the absolute amount of free disk space. The largest amount of absolute free disk space is used as the server and partition on which to create the new mailbox.</p>
<p>On a Cyrus IMAP Murder frontend, a default backend can be configured using the <strong>defaultserver</strong> setting in <a class="reference internal" href="../manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>, and on a Cyrus IMAP Murder backend, a default partition can be configured with the <strong>defaultpartition</strong> setting in <a class="reference internal" href="../manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>.</p>
<p>As of Cyrus IMAP 2.5, the server and/or partition on which new mailboxes are created is fully configurable, and provides a lot more option value with more intelligent selection routines available. Please note that the related settings can be changed at any time and without impact to existing mailboxes.</p>
<p>In Cyrus IMAP 2.5, the backend server and/or partition selection can be controlled with <strong>serverlist_select_mode</strong> for frontend server selection, and <strong>partition_select_mode</strong> for backend partition selection. The <strong>partition_select_mode</strong> naturally applies to stand-alone Cyrus IMAP 2.5 servers not part of a murder topology as well.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>Only on Mailbox Creation</strong></p>
<p>Please note that the settings only impact backend and partition selection during the creation of mailboxes. No automatic balancing of mailboxes by number, use or size during runtime is currently available, nor is any storage hierarchy concept.</p>
</div>
<div class="section" id="selection-modes">
<h2>Selection Modes<a class="headerlink" href="#selection-modes" title="Permalink to this headline">¶</a></h2>
<p>Selection modes configurable on frontend and backend share the same principles. In each case, a list of available items are considered: those are the backends when creating the mailbox through a frontend, and the partitions when being on the backend. Depending on the configured selection mode, each item has an associated (disk) capacity and free space which will be used to select the most fitting one.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>Unified murder</strong>
Please remember that when using a unified murder configuration, a server is both a frontend and a backend: you can create and access local or remote mailboxes. Since configuration settings are distinct for each role the server can take, you can apply different selection modes for each role.</p>
</div>
<div class="section" id="available-selection-modes">
<h3>Available Selection Modes<a class="headerlink" href="#available-selection-modes" title="Permalink to this headline">¶</a></h3>
<p><strong>random</strong></p>
<blockquote>
<div><p>Choice is (pseudo-)random. Each item has the same probability of being selected.</p>
</div></blockquote>
<p><strong>freespace-most</strong></p>
<blockquote>
<div><p>The item which has the most free space (counted in KiB units) is selected. That is the default selection mode.</p>
<div class="line-block">
<div class="line">Example: Suppose that the available items are:</div>
<div class="line"><br /></div>
<div class="line"><strong>item1</strong> with 1000GB of capacity, 400GB being free (40% free space)</div>
<div class="line"><strong>item2</strong> with 1000GB of capacity, 600GB being free (60% free space)</div>
<div class="line"><strong>item3</strong> with 100GB of capacity, 30GB being free (30% free space)</div>
<div class="line"><strong>item4</strong> with 100GB of capacity, 70GB being free (70% free space)</div>
<div class="line"><br /></div>
<div class="line">In this case <strong>item2</strong> will be selected as most fitting, since 600GB of free space is the biggest space of all.</div>
</div>
</div></blockquote>
<p><strong>freespace-percent-most</strong></p>
<blockquote>
<div><p>The item which has the most percentage of free space is selected.</p>
<div class="line-block">
<div class="line">Example: Suppose that the available items are:</div>
<div class="line"><br /></div>
<div class="line"><strong>item1</strong> with 1000GB of capacity, 400GB being free (40% free space)</div>
<div class="line"><strong>item2</strong> with 1000GB of capacity, 600GB being free (60% free space)</div>
<div class="line"><strong>item3</strong> with 100GB of capacity, 30GB being free (30% free space)</div>
<div class="line"><strong>item4</strong> with 100GB of capacity, 70GB being free (70% free space)</div>
</div>
<div class="line-block">
<div class="line">In this case <strong>item4</strong> would be selected as most fitting, since 70% of free space is the largest percentage of all.</div>
</div>
</div></blockquote>
<p><strong>freespace-percent-weighted</strong></p>
<blockquote>
<div><p>For each item, the percentage of free space is its weight. Then a weighted choice is performed to select one of those items.
As such, the more free space the item has, the more chances it has to be selected.</p>
<div class="line-block">
<div class="line">Example:</div>
<div class="line"><br /></div>
<div class="line"><strong>item1</strong> with 1000GB of capacity, 400GB being free (40% free space), weight is 40</div>
<div class="line"><strong>item2</strong> with 1000GB of capacity, 600GB being free (60% free space), weight is 60</div>
<div class="line"><strong>item3</strong> with 100GB of capacity, 30GB being free (30% free space), weight is 30</div>
<div class="line"><strong>item4</strong> with 100GB of capacity, 70GB being free (70% free space), weight is 70</div>
<div class="line"><br /></div>
<div class="line">The sum of the weights being 200, the probability for each item to be selected as most fitting would be::</div>
<div class="line"><br /></div>
<div class="line">100 * (40 / 200) = 20% for item1</div>
<div class="line">100 * (60 / 200) = 30% for item2</div>
<div class="line">100 * (30 / 200) = 15% for item3</div>
<div class="line">100 * (70 / 200) = 35% for item4</div>
</div>
</div></blockquote>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>Usage convergence</strong>
Using the freespace-percent-weighted mode, the percentage usages will converge towards 100%. So if they have different usages, those differences will stay and only really diminish upon reaching 100% of usage.</p>
<p>You may also observe growing differences between items usages when they do not have the same total disk space.</p>
</div>
<p><strong>freespace-percent-weighted-delta</strong></p>
<blockquote>
<div><p>As for <strong>freespace-percent-weighted</strong>, a weight is associated to each item. It is computed as follows:</p>
<p><code class="docutils literal notranslate"><span class="pre">(*percentage</span> <span class="pre">of</span> <span class="pre">freespace</span> <span class="pre">of</span> <span class="pre">item*)</span> <span class="pre">-</span> <span class="pre">(*lowest</span> <span class="pre">percentage</span> <span class="pre">of</span> <span class="pre">freespace</span> <span class="pre">of</span> <span class="pre">all</span> <span class="pre">items*)</span> <span class="pre">+</span> <span class="pre">0.5</span></code></p>
<p>Then a weighted choice is performed to select one of those items.</p>
<p>(The added 0.5 in item’s weight is so that selection gets smoother when all items usage percentages get close to each other.)</p>
<p>As such, considering the usage percentages, the more the item is lagging behind the most used one (which has the lowest percentage of free space), the more chances it has to be selected.</p>
<div class="line-block">
<div class="line">Example: In the same conditions as above, the weight of each item would be::</div>
<div class="line"><br /></div>
<div class="line">40 - 30 + 0.5 = 10.5 for item1</div>
<div class="line">60 - 30 + 0.5 = 30.5 for item2</div>
<div class="line">30 - 30 + 0.5 = 0.5 for item3</div>
<div class="line">0 - 30 + 0.5 = 40.5 for item4</div>
</div>
<div class="line-block">
<div class="line">The sum of the weights being 82, the probability for each item to be selected as most fitting would be::</div>
<div class="line"><br /></div>
<div class="line">100 * (10.5 / 82) = 12.8% for item1</div>
<div class="line">100 * (30.5 / 82) = 37.2% for item2</div>
<div class="line">100 * (0.5 / 82) = 0.6% for item3</div>
<div class="line">100 * (40.5 / 82) = 49.4% for item4</div>
</div>
</div></blockquote>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>Usage convergence</strong>
Using the freespace-percent-weighted-delta mode, items percentage usages will converge towards the most used one. And then items usage will grow equally.</p>
</div>
</div>
<div class="section" id="guidelines">
<h3>Guidelines<a class="headerlink" href="#guidelines" title="Permalink to this headline">¶</a></h3>
<p>Which mode to use depends primarily on whether you are building the platform from scratch, or adding servers and partitions and if you plan to create a lot of empty mailboxes in a short period of time.</p>
<p>The Selection mode can be changed as needed.</p>
<p>If you plan to create a lot of empty mailboxes in a short period of time, use <strong>random</strong>. The other modes rely on the amount of freespace on backends and partitions, and thus would create most (if not all) the mailboxes at the same place, which will become an issue later as those mailboxes grow.</p>
<p>If you only care about the amount of free space, you can use the default mode (<strong>freespace-most</strong>) or <strong>freespace-percent-most</strong>.</p>
<p>Otherwise you should use <strong>freespace-percent-weighted-delta</strong>, which is generally good enough for situations where mailbox creation pace is slow, or <strong>freespace-percent-weighted</strong>.</p>
</div>
</div>
<div class="section" id="special-cases">
<h2>Special cases<a class="headerlink" href="#special-cases" title="Permalink to this headline">¶</a></h2>
<div class="section" id="what-happens-when-two-items-are-equal-as-most-fitting">
<h3>What happens when two items are equal as most fitting ?<a class="headerlink" href="#what-happens-when-two-items-are-equal-as-most-fitting" title="Permalink to this headline">¶</a></h3>
<p>The freespace-most and freespace-percent-most modes do select the item with the most free space or percent of free space. It may happen that two or more items do have the same value. If this value appears as most fitting, only one item will be selected, but you may not know in advance which one will be. In particular, it may not be the first one that appears listed in your configuration.</p>
<p>Also note that after the mailbox is created on the selected item, it will have less free space and thus shall not be seen as most fitting next time.</p>
</div>
<div class="section" id="what-happens-when-two-items-are-actually-the-same">
<h3>What happens when two items are actually the same ?<a class="headerlink" href="#what-happens-when-two-items-are-actually-the-same" title="Permalink to this headline">¶</a></h3>
<p>Each item has an associated id:</p>
<ul class="simple">
<li><p>its name for a backend</p></li>
<li><p>its device id for a partition</p></li>
</ul>
<p>If two or more items share the same id when using the freespace-most or freespace-percent-most mode, only one of those items will actually be checked, as if the others were not configured. You may not know in advance which one will be.</p>
</div>
<div class="section" id="items-exclusion">
<h3>Items Exclusion<a class="headerlink" href="#items-exclusion" title="Permalink to this headline">¶</a></h3>
<p>When using a selection mode other than random, items can be automatically excluded if their usage percentage is beyond a configured integer setting:</p>
<ul class="simple">
<li><p><strong>serverlist_select_soft_usage_limit</strong> on a frontend</p></li>
<li><p><strong>partition_select_soft_usage_limit</strong> on a backend</p></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Soft usage limit
If all items are beyond the configured value, this feature is automatically deactivated. An item is thus selected as if the setting was not set.</p>
</div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Exclusion is not absolute
Items are only excluded when creating a new user mailbox according to the configured selection mode.
If you explicitly specify an excluded item, the mailbox will be created on that item.
Mailboxes previously created there are of course still accessible, and subfolders are by default still created at the same place than the parent folder.</p>
</div>
</div>
<div class="section" id="items-usage-data-reset">
<h3>Items Usage Data Reset<a class="headerlink" href="#items-usage-data-reset" title="Permalink to this headline">¶</a></h3>
<p>By default items usage data are retrieved only once upon service initialization (that is when an imapd instance is created). This only concerns selection modes other than random.</p>
<p>If you tend to use the same service instance for a long lapse of time and perform a large amount of mailboxes creation, usage data will soon be out-of-date. For the cases where it is useful to refresh those data, you can configure the number of creation requests after which data are reset:</p>
<ul class="simple">
<li><p><strong>serverlist_select_usage_reinit</strong> for a frontend</p></li>
<li><p><strong>partition_select_usage_reinit</strong> for a backend</p></li>
</ul>
</div>
</div>
<div class="section" id="application">
<h2>Application<a class="headerlink" href="#application" title="Permalink to this headline">¶</a></h2>
<p>What each item (disk) capacity and free space represents depends on the situation.</p>
<div class="section" id="on-backend">
<h3>On backend<a class="headerlink" href="#on-backend" title="Permalink to this headline">¶</a></h3>
<p>On the backend a partition is represented by its disk capacity and free space. Each example listed in Available Selection Modes can be interpreted in a straightforward way by replacing references to item by partition.</p>
</div>
<div class="section" id="on-frontend">
<h3>On frontend<a class="headerlink" href="#on-frontend" title="Permalink to this headline">¶</a></h3>
<p>On the frontend a backend is represented by its available partition with the most percentage of free space, except for the <strong>freespace-most</strong> mode where it is the sum of all its available partitions. Of course this does not apply to the <strong>random</strong> mode.</p>
<div class="section" id="example-of-backend-representation-on-frontend">
<h4>Example of backend representation on frontend<a class="headerlink" href="#example-of-backend-representation-on-frontend" title="Permalink to this headline">¶</a></h4>
<blockquote>
<div><p>Suppose that a backend has a 2000GiB capacity, 900GiB being free (45% free space), composed of 2 partitions</p>
<ul class="simple">
<li><p><strong>part1</strong> which has a 1000GiB capacity, 200GiB being free (20% free space)</p></li>
<li><p><strong>part2</strong> which has a 1000GiB capacity, 700GiB being free (70% free space)</p></li>
</ul>
<p>That backend would be represented by:</p>
<ul class="simple">
<li><p>its partition <strong>part2</strong> for the <strong>freespace-percent-most</strong>, <strong>freespace-percent-weighted</strong> and <strong>freespace-percent-weighted-delta</strong> modes, since that partition has the most percentage of free space: that is a 1000GiB capacity, 700GiB being free (70% free space)</p></li>
<li><p>the sum of all its available partitions for the <strong>freespace-most</strong> mode: that is a 2000GiB capacity, 900GiB being free (45% free space)</p></li>
</ul>
</div></blockquote>
<p>Keeping that in mind, you can refer to examples listed in Available Selection Modes to determine how most fitting backends are selected.</p>
</div>
</div>
<div class="section" id="backends-exclusion">
<h3>Backends Exclusion<a class="headerlink" href="#backends-exclusion" title="Permalink to this headline">¶</a></h3>
<p>For details on exclusion based on disk usage, see Section “Items Exclusion”.</p>
<div class="section" id="example-of-backend-exclusion-using-serverlist-select-soft-usage-limit">
<h4>Example of backend exclusion using serverlist_select_soft_usage_limit<a class="headerlink" href="#example-of-backend-exclusion-using-serverlist-select-soft-usage-limit" title="Permalink to this headline">¶</a></h4>
<p>The backend in “Example of backend representation on frontend” would be excluded using the <strong>freespace-most</strong> selection mode and setting <strong>serverlist_select_soft_usage_limit</strong> to 50 since in that mode it is represented by a disk usage of 55%. In other modes it would not be excluded, since it would be represented by a disk usage of 30%.</p>
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