1.. _imap-admin-quotas-types: 2 3Supported Quota Types 4===================== 5 6The Cyrus IMAP server supports quotas on Storage (KB), Messages (#), 7Folders (#) and Annotation Storage (KB). These types each have their 8own identifier: 9 10 * STORAGE 11 * MESSAGE 12 * X-NUM-FOLDERS 13 * X-ANNOTATION-STORAGE 14 15Storage Quotas 16-------------- 17 18Storage quotas are defined as the number of kilobytes (KB) of the 19relevant :rfc:`822` messages located within a quota root. Each copy of 20a message is counted independently, even when the server can conserve 21disk space use by making hard links to message files. The additional 22disk space overhead used by mailbox index and cache files is not 23charged against a quota. On servers with ``delete_mode: delayed`` 24and/or ``expunge_mode:delayed`` space used by deleted mailboxes or 25expunged messages are not charged against quota. 26 27Numeric Quotas 28-------------- 29 30Numeric Quotas are quite simply a limit on the number of a particular 31class of object. Cyrus IMAP currently supports quotas on the number of 32messages and/or folders below a given quota root. 33