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Dovecot RFC Support ​

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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)
  • 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

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)
  • 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 “$Important” Keyword and “\Important” Special-Use Attribute (RFC 8457)
  • 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.

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