Dovecot RFC Support

INFO

This is a non-exhaustive list of RFCs that Dovecot implements/supports.

Email

• Standard for ARPA Internet Text (RFC 822)
• Internet Message Format (updated RFC 822) (RFC 2822)
• Multipurpose Internet Mail Extensions (MIME) (part 1) (RFC 2045)
• Multipurpose Internet Mail Extensions (MIME) (part 2) (RFC 2046)
• Multipurpose Internet Mail Extensions (MIME) (part 3) (RFC 2047)
• Multipurpose Internet Mail Extensions (MIME) (part 4) (RFC 2048)
• Multipurpose Internet Mail Extensions (MIME) (part 5) (RFC 2049)

Authentication

• Anonymous SASL Mechanism (RFC 2245)
• Using TLS with IMAP, POP3 and ACAP (RFC 2595)
• Using Digest Authentication as a SASL Mechanism (DIGEST-MD5) (RFC 2831)
• Salted Challenge Response Authentication Mechanism (SCRAM) (RFC 5802)
• SCRAM-SHA-256 and SCRAM-SHA-256-PLUS Simple Authentication and Security Layer (SASL) Mechanisms (RFC 7677)
• GSS-API (Kerberos V5) SASL Mechanism (RFC 4752)
• A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth (RFC 7628)
• Google XOAUTH2 Protocol
• Channel Bindings for TLS 1.3 (RFC 9266)

POP3

• Post Office Protocol - Version 3 (RFC 1939)
• POP3 Extension Mechanism (RFC 2449)
• Using TLS with IMAP, POP3 and ACAP (RFC 2595)
• The SYS and AUTH POP Response Codes (RFC 3206)
• The Post Office Protocol (POP3) - Simple Authentication and Security Layer (SASL) Authentication Mechanism (RFC 5034)

IMAP (Base)

• IMAP4rev1 (RFC 3501)
• IMAP4 Multi-Accessed Mailbox Practice (RFC 2180)
• Using TLS with IMAP, POP3 and ACAP (RFC 2595)
• IMAP4 Implementation Recommendations (RFC 2683)

IMAP (Extensions)

• IMAP4 QUOTA extension (RFC 2087)
• IMAP4 non-synchronizing literals (LITERAL+) (RFC 2088)
• IMAP4 IDLE command (RFC 2177)
• IMAP4 Login Referrals (RFC 2221)
• IMAP4 Namespace (RFC 2342)
• IMAP4 ID extension (RFC 2971)
• IMAP4 Child Mailbox Extension (RFC 3348)
• IMAP4 MULTIAPPEND Extension (RFC 3502)
• IMAP4 Binary Content Extension (RFC 3516)
• IMAP4 UNSELECT command (RFC 3691)
• IMAP4 Access Control List (ACL) Extension (RFC 4314)
• IMAP UIDPLUS extension (RFC 4315)
• IMAP URLAUTH Extension (RFC 4467)
• IMAP CATENATE Extension (RFC 4469)
• IMAP Extension for Conditional STORE Operation or Quick Flag Changes Resynchronization (RFC 4551)
• IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned (RFC 4731)
• IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response (RFC 4959)
• The IMAP COMPRESS Extension (RFC 4978)
• WITHIN Search Extension to the IMAP Protocol (RFC 5032)
• The IMAP ENABLE Extension (RFC 5161)
• IMAP4 Extensions for Quick Mailbox Resynchronization (RFC 5162)
• IMAP Extension for Referencing the Last SEARCH Result (RFC 5182)
• IMAP Internationalization (I18NLEVEL=1 only) (RFC 5255)
• IMAP SORT and THREAD Extensions (RFC 5256)
• IMAP4 - LIST Command Extensions (RFC 5258)
• Contexts for IMAP4 (ESORT and CONTEXT=SEARCH only) (RFC 5267)
• The IMAP METADATA Extension (RFC 5464)
• The IMAP NOTIFY Extension (RFC 5465)
• Extended URLFETCH for Binary and Converted Parts (RFC 5524)
• IMAP Response Codes (RFC 5530)
• Support for PARTIAL in CATENATE and URLAUTH (RFC 5550, Section 5.7.1)
• IMAP4 Extension for Returning STATUS Information in Extended LIST (RFC 5819)
• Display-Based Address Sorting for the IMAP4 SORT Extension (RFC 5957)
• IMAP LIST Extension for Special-Use Mailboxes (SPECIAL-USE only) (RFC 6154)
• IMAP4 Extension for Fuzzy Search (RFC 6203)
• Support for IMAP Events in Sieve (RFC 6785)
• Internet Message Access Protocol (IMAP) - MOVE Extension (RFC 6851)
• IMAP Extensions: Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC) (updated RFC 4551 and RFC 5162) (RFC 7162)
• IMAP4 Non-synchronizing Literals (updated RFC 2088) (RFC 7888)
• IMAP Extension for STATUS=SIZE (RFC 8438)
• IMAP4 Extension for Returning MYRIGHTS Information in Extended LIST (RFC 8440)
• IMAP “$Important” Keyword and “\Important” Special-Use Attribute (RFC 8457)
• IMAP REPLACE Extension (RFC 8508)
• Internet Message Access Protocol (IMAP) - SAVEDATE Extension (RFC 8514)
• IMAP4 Extension: Message Preview Generation (RFC 8970)
• IMAP Response Code for Command Progress Notification (RFC 9585)

SMTP/LMTP (Base)

• Simple Mail Transfer Protocol (RFC 821)
• Simple Mail Transfer Protocol (updated RFC 821) (RFC 2821)
• Simple Mail Transfer Protocol (updated RFC 2821) (RFC 5321)
• Local Mail Transfer Protocol (RFC 2023)
• Message Submission for Mail (RFC 6409)

SMTP/LMTP (Extensions)

• SMTP Service Extension for Message Size Declaration (RFC 1870)
• SMTP Service Extension for Returning Enhanced Error Codes (RFC 2034)
• SMTP Service Extension for Command Pipelining (RFC 2920)
• SMTP Service Extensions for Transmission of Large and Binary MIME Messages (RFC 3030)
• SMTP Service Extension for Secure SMTP over Transport Layer Security (RFC 3207)
• Message Submission BURL Extension (RFC 4468)
• SMTP Service Extension for Authentication (RFC 4954)
• SMTP Service Extension for 8-bit MIME Transport (RFC 6152)

Dovecot Specific Extensions

SEARCH=MIMEPART

SEARCH=MIMEPART IMAP Extension

• Body and Header searches not yet implemented.