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Managing user_deny.db
=====================
The user_deny database allows you to deny access via POP/IMAP even if the user can authenticate to the Cyrus server. For example, if the authentication data is also used for other network services.
Use :cyrusman:`cyr_deny(8)` to manage the database.
If the user_deny.db file doesn't exist in %configdirectory% (often /var/lib/imap) then you'll need to create it. In the example below, /var/lib/imap/ is used.
::
# echo "" > /tmp/user_deny.flat
# /usr/lib/cyrus-imapd/cvt_cyrusdb /tmp/user_deny.flat flat /var/lib/imap/user_deny.db skiplist
# chown cyrus:cyrus /var/lib/imap/user_deny.db
The database specification can be found at :ref:`imap-concepts-deployment-db-userdeny`.
::
# su - cyrus
$ cyr_dbtool /var/lib/imap/user_deny.db skiplist set **username** "2<tab>pop3<tab>Can't use pop."
Here `pop3` is the service name as spelled in :cyrusman:`cyrus.conf(5)`. In order to type a tab character, you will need to escape your tabs. In bash, this is done by typing CTRL-v and then pressing Tab.
If you got it right, when you authenticate via pop3 you should see something like the following::
$ telnet mail.example.org 110
Trying 192.168.0.2...
Connected to mail.example.org.
Escape character is '^]'.
+OK mail.example.org Cyrus POP3 v2.4.17 server ready <18418688457439930663.1399062365@mail.example.org>
USER **username**
+OK Name is a valid mailbox
-ERR [SYS/TEMP] Can't use pop.
Connection closed by foreign host.
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