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.. _imap-admin-quotas-roots:
Quota Roots
===========
Quotas are applied to quota roots, which can be at any level of the mailbox hierarchy. Quota roots need not also be mailboxes.
Quotas on a quota root apply to the sum of the usage of any mailbox at that level and any sub-mailboxes of that level that are not underneath a quota root on a sub-hierarchy. This means that each mailbox is limited by at most one quota root.
For example, if the mailboxes
::
user/bovik
user/bovik/list/imap
user/bovik/list/info-cyrus
user/bovik/saved
user/bovik/todo
exist and the quota roots
::
user/bovik
user/bovik/list
user/bovik/saved
exist, then the quota root ``user/bovik`` applies to the mailboxes ``user/bovik`` and ``user/bovik/todo``; the quota root ``user/bovik/list`` applies to the mailboxes ``user/bovik/list/imap`` and ``user/bovik/list/info-cyrus``; and the quota root ``user/bovik/saved`` applies to the mailbox ``user/bovik/saved``.
Quota roots are created automatically when they are mentioned in the
:ref:`imap-reference-manpages-systemcommands-cyradm-setquota` command. Quota
roots may not be deleted through the protocol, see Removing Quota Roots
for instructions on how to delete them.
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