Suported RFCs

- 1733 Distributed Electronic Mail Models in IMAP4
- 2088 IMAP4 non-synchronizing literals
- 2177 IMAP4 IDLE command
- 2180 IMAP4 Multi-Accessed Mailbox Practice
- 2595 Using TLS with IMAP, POP3 and ACAP
- 2683 IMAP4 Implementation Recommendations
- 2971 IMAP4 ID extension
- 3348 The Internet Message Action Protocol (IMAP4) Child Mailbox Extension
- 3501 INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1
- 3516 IMAP4 Binary Content Extension
- 3691 Internet Message Access Protocol (IMAP) UNSELECT command
- 4315 (2359) Internet Message Access Protocol (IMAP) - UIDPLUS extension
- 4466 Collected Extensions to IMAP4 ABNF
- 4467 Internet Message Access Protocol (IMAP) - URLAUTH Extension
- 4468 Message Submission BURL Extension
- 4469 Internet Message Access Protocol (IMAP) CATENATE Extension
- 4551 IMAP Extension for Conditional STORE Operation or Quick Flag Changes Resynchronization
- 4731 IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned
- 4978 The IMAP COMPRESS Extension
- 5092 (2192) IMAP URL Scheme
- 5161 The IMAP ENABLE Extension
- 5162 IMAP4 Extensions for Quick Mailbox Resynchronization
- 5256 Internet Message Access Protocol - SORT and THREAD Extensions
- 5258 Internet Message Access Protocol version 4 - LIST Command Extensions
- 5267 Contexts for IMAP4
- 5530 IMAP Response Codes
- 5550 (4550) The Internet Email to Support Diverse Service Environments (Lemonade) Profile
- 5788 IMAP4 Keyword Registry
- 5819 IMAP4 Extension for Returning STATUS Information in Extended LIST
- 5957 Display-Based Address Sorting for the IMAP4 SORT Extension
- 6203 IMAP4 Extension for Fuzzy Search

To be evaluated:
- 5465 The IMAP NOTIFY Extension
- 6154 IMAP LIST Extension for Special-Use Mailboxes

Obsolete:
- 1064 INTERACTIVE MAIL ACCESS PROTOCOL - VERSION 2
- 1176 Interactive Mail Access Protocol: Version 2
- 1203 Interactive Mail Access Protocol: Version 3
- 1730 Internet Message Access Protocol - Version 4
- 1732 IMAP4 Compatibility with IMAP2 and IMAP2bis
- 2060 Internet Message Access Protocol - Version 4rev1
- 2061 IMAP4 Compatibility with IMAP2bis
- 2062 Internet Message Access Protocol - Obsolete Syntax
- 2086 IMAP4 ACL extension
- 2095 IMAP/POP AUTHorize Extension for Simple Challenge/Response
- 2192 IMAP URL Scheme
- 2359 IMAP4 UIDPLUS extension

Not implemented:
- 1731 IMAP4 Authentication Mechanisms
- 2087 IMAP4 QUOTA extension
- 2193 IMAP4 Mailbox Referrals
- 2195 (2095) IMAP/POP AUTHorize Extension for Simple Challenge/Response
- 2221 IMAP4 Login Referrals
- 2342 IMAP4 Namespace
- 3502 Internet Message Access Protocol (IMAP) - MULTIAPPEND Extension
- 3503 Message Disposition Notification (MDN) profile for Internet Message Access Protocol (IMAP)
- 4314 (2086) IMAP4 Access Control List (ACL) Extension
- 4549 Synchronization Operations for Disconnected IMAP4 Clients
- 4959 IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response
- 5032 WITHIN Search Extension to the IMAP Protocol
- 5182 IMAP Extension for Referencing the Last SEARCH Result
- 5255 Internet Message Access Protocol Internationalization
- 5257 Internet Message Access Protocol - ANNOTATE Extension
- 5259 Internet Message Access Protocol - CONVERT Extension
- 5464 The IMAP METADATA Extension
- 5466 IMAP4 Extension for Named Searches (Filters)
- 5593 Internet Message Access Protocol (IMAP) - URL Access Identifier Extension
- 5616 Streaming Internet Messaging Attachments
- 5738 IMAP Support for UTF-8
- 6186 Use of SRV Records for Locating Email Submission/Access Services
- 6237 IMAP4 Multimailbox SEARCH Extension

Irrelevant stuff:
- 3656 The Mailbox Update (MUPDATE) Distributed Mailbox Database Protocol
- 3807 V5.2-User Adaptation Layer (V5UA)
- 4416 Goals for Internet Messaging to Support Diverse Service Environments
- 5232 Sieve Email Filtering: Imap4flags Extension
- 5423 Internet Message Store Events
- 5524 Extended URLFETCH for Binary and Converted Parts
