IMAP Server Specifications

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The different capabilities of the different imap servers.

RFC Name Capability name Courier Cyrus DBMail Dovecot UW-IMAP
2087 IMAP4 QUOTA extension QUOTA yes yes yes v1.0 no
2088 IMAP4 non-synchronizing literals LITERAL+ no v1.5 no v1.0 yes
2177 IMAP4 IDLE command IDLE yes v2.0 yes v1.0 yes
2193 IMAP4 Mailbox Referrals MAILBOX-REFERRALS no v2.1 no no yes
2221 IMAP4 Login Referrals LOGIN-REFERRALS no no no v1.0 yes
2342 IMAP4 Namespace NAMESPACE yes v1.6 yes v1.0 yes
2971 IMAP4 ID extension ID no v1.6 no v1.2 no
3348 IMAP4 Child Mailbox Extension CHILDREN yes v2.1 yes v1.0 yes
3502 IMAP4 MULTIAPPEND Extension MULTIAPPEND no v2.0 no v1.0 yes
3516 IMAP4 Binary Content Extension BINARY no v2.2 no no yes
3691 http://www.ietf.org/rfc/rfc3691.txt IMAP4 UNSELECT command] UNSELECT no v1.6 yes v1.0 yes
4314 IMAP4 Access Control List (ACL) Extension ACL yes yes yes v1.2 no
4314 IMAP4 Access Control List (ACL) Extension RIGHTS=* no v2.3 no v1.2 no
4315 IMAP UIDPLUS extension UIDPLUS yes v1.6 no v1.1 yes
4467 IMAP - URLAUTH Extension URLAUTH no v2.4 no no no
4469 IMAP CATENATE Extension CATENATE no v2.3 no no no
4551 IMAP Extension for Conditional STORE Operation or Quick Flag Changes Resynchronization CONDSTORE no v2.3 no v1.2 no
4731 IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned ESEARCH no v2.4 no v1.2 yes
4959 IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response SASL-IR no v2.2 no v1.1 yes
4978 The IMAP COMPRESS Extension COMPRESS=DEFLATE no v2.4 no v2.0 no
5032 WITHIN Search Extension to the IMAP Protocol WITHIN no v2.4 no v1.2+ yes
5162 IMAP4 Extensions for Quick Mailbox Resynchronization QRESYNC no v2.4 no v1.2 no
5182 IMAP Extension for Referencing the Last SEARCH Result SEARCHRES no no no v1.2 no
5255 IMAP Internationalization I18NLEVEL=1 no no no v1.1 yes
5255 IMAP Internationalization I18NLEVEL=2 no no no no no
5256 IMAP SORT and THREAD Extensions SORT yes v2.0 yes v1.0 yes
5256 IMAP SORT and THREAD Extensions THREAD=ORDEREDSUBJECT yes v2.0 yes no yes
5256 IMAP SORT and THREAD Extensions THREAD=REFERENCES yes v2.0 no v1.0 yes
5257 IMAP - ANNOTATE Extension ANNOTATE-EXPERIMENT-1 no no no no no
5258 IMAP4 - LIST Command Extensions LIST-EXTENDED no v2.4 no v1.1 no
5259 IMAP - CONVERT Extension CONVERT no no no no no
5267 Contexts for IMAP4 ESORT no no no v1.2 no
5267 Contexts for IMAP4 CONTEXT=SEARCH no no no v1.2 no
5267 Contexts for IMAP4 CONTEXT=SORT no no no no no
5464 The IMAP METADATA Extension METADATA no no no no no
5465 The IMAP NOTIFY Extension NOTIFY no no no no no
5466 IMAP4 Extension for Named Searches (Filters) FILTERS no no no no no
5524 Extended URLFETCH for Binary and Converted Parts URLAUTH=BINARY no v2.4 no no no
5530 IMAP Response Codes - no no no v1.2 no
5819 IMAP4 Extension for Returning STATUS Information in Extended LIST LIST-STATUS no no no v1.2 no