RFC 5161: The IMAP ENABLE Extension

Most IMAP extensions are used by the client when it wants to and the server supports it. However, a few extensions require the server to know whether a client…

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Outgoing relationships (2 related RFCs)

Normative reference — RFC 5234: Augmented BNF for Syntax Specifications: ABNF
Normative reference — RFC 3501: INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1

Incoming relationships (3 related RFCs)

Normatively referenced by — RFC 6855: IMAP Support for UTF-8
Normatively referenced by — RFC 5162: IMAP4 Extensions for Quick Mailbox Resynchronization
Normatively referenced by — RFC 5550: The Internet Email to Support Diverse Service Environments (Lemonade) Profile