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IMAP Extensions

Extension	Description	Reference
ACL	Access control lists (ACLs)	RFC 4314
ANNOTATE	Maintain metadata	draft-ietf-imapext-annotate
ANNOTATEMORE	Maintain more metadata	draft-daboo-imap-annotatemore
BINARY	Binary content	RFC 3516
CATENATE	Message assembly from pieces	RFC 4469
COMPRESS=DEFLATE	Compression	draft-ietf-lemonade-compress
CONDSTORE	Conditional storage to a mailbox	RFC 4451
ESEARCH	Adds SEARCH return options that control what kind of information is returned	RFC 4731
ID	Identify the IMAP software	RFC 2971
IDLE	Push new mail notifications	RFC 2177
LITERAL+	Non-synchronising literals	RFC 2088
LOGIN-REFERRALS	Login referrals	RFC 2221
MAILBOX-REFERRALS	Mailbox referrals	RFC 2193
MULTIAPPEND	Multi-appending	RFC 3502
NAMESPACE	mailbox namespaces	RFC 2342
QUOTA	Resource usage	RFC 2087
SEARCHRES	Allows to easily reference the result of the last SEARCH command in other subsequent commands	draft-melnikov-imap-search-res
SORT	Sorting of views	draft-ietf-imapext-sort
THREAD	Server-based threading	draft-ietf-imapext-sort
UIDPLUS	Better disconnected support	RFC 4315
UNSELECT	Closes the mailbox without expunging it	RFC 3691
URLAUTH	Signed URLs for access	RFC 4467
WITHIN	Extension to IMAP SEARCH	RFC 5032

The following extensions have been withdrawn or are expired:

COMMAND+, extend IMAP commands: expired
VIEW, process a subset of messages: withdrawn and replaced by WINDOW

Other drafts of interest include:

Synchronization operations for disconnected IMAP4 clients (RFC 4549)

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