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 setquota command. Quota roots may not be deleted through the protocol, see Removing Quota Roots for instructions on how to delete them.