IMAP protocol and extensions supported:

    [IMAP4rev1]        RFC 3501: Internet Message Access Protocol - Version 4rev1
    [LOGINDISABLED]    RFC 3501: Internet Message Access Protocol - Version 4rev1
    [STARTTLS]         RFC 3501: Internet Message Access Protocol - Version 4rev1
    [AUTH=PLAIN]       RFC 4616: The PLAIN Simple Authentication and Security Layer (SASL) Mechanism
    [AUTH=GSSAPI]      RFC 1731: IMAP4 Authentication Mechanisms
    [ACL]              RFC 4314: IMAP4 Access Control List (ACL) Extension
    [BINARY]           RFC 3516: IMAP4 Binary Content Extension
    [CATENATE]         RFC 4469: Internet Message Access Protocol (IMAP) CATENATE Extension
    [CHILDREN]         RFC 3348: IMAP4 Child Mailbox Extension
    [CONDSTORE]        RFC 4551: IMAP Extension for Conditional STORE Operation or Quick Flag Changes Resynchronization
    [ENABLE]           RFC 5161: The IMAP ENABLE Extension
    [ESEARCH]          RFC 4731: IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned
    [ESORT]            RFC 5267: Contexts for IMAP4
    [I18NLEVEL=1]      RFC 5255: Internet Message Access Protocol Internationalization
    [ID]               RFC 2971: IMAP4 ID Extension
    [IDLE]             RFC 2177: IMAP4 IDLE command
    [IMAPURL]          RFC 2192: IMAP URL Scheme
    [LIST-EXTENDED]    RFC 5258: Internet Message Access Protocol version 4 - LIST Command Extensions
    [LIST-STATUS]      RFC 5819: IMAP4 Extension for Returning STATUS Information in Extended LIST
    [LITERAL+]         RFC 2088: IMAP4 non-synchronizing literals
    [LOGIN-REFERRALS]  RFC 2221: IMAP4 Login Referrals
    [MULTIAPPEND]      RFC 3502: Internet Message Access Protocol (IMAP) - MULTIAPPEND Extension
    [NAMESPACE]        RFC 2342: IMAP4 Namespace
    [QRESYNC]          RFC 5162: IMAP4 Extensions for Quick Mailbox Resynchronization
    [QUOTA]            RFC 2087: IMAP4 QUOTA extension
    [RIGHTS=ektx]      RFC 4314: IMAP4 Access Control List (ACL) Extension
    [SASL-IR]          RFC 4959: IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response
    [SEARCHRES]        RFC 5182: IMAP Extension for Referencing the Last SEARCH Result
    [SORT]             RFC 5256: Internet Message Access Protocol - SORT and THREAD Extensions
    [THREAD=ORDEREDSUBJECT]  RFC 5256: Internet Message Access Protocol - SORT and THREAD Extensions
    [UIDPLUS]          RFC 4315: Internet Message Access Protocol (IMAP) - UIDPLUS extension
    [UNSELECT]         RFC 3691: IMAP UNSELECT command
    [WITHIN]           RFC 5032: WITHIN Search Extension to the IMAP Protocol
    [$MDNSent]         RFC 3503: Message Disposition Notification (MDN) profile for Internet Message Access Protocol (IMAP)

    Also support AUTH=X-ZIMBRA:
       Initial (and only) SASL response is identical to that of AUTH PLAIN, except that X-ZIMBRA takes a valid Zimbra auth token
       as the password (e.g. "authzid^@authcid^@authtoken").  The authtoken must match authcid, and then the normal authorization
       check is made for authzid with the caveat that admin access is granted only if the supplied authtoken is an admin token.

POP protocol and extensions supported:

    RFC 1939: Post Office Protocol - Version 3 
    
        supported: DELE, LIST, NOOP, PASS, QUIT, RETR, STAT, TOP, UIDL, USER
      unsupported: APOP (optional, and requires clear-text password to be stored)
    
    RFC 2449: POP3 Extension Mechanism
    
        supported: CAPA, TOP, USER, UIDL, EXPIRE, IMPLEMENTATION
      unsupported: SASL, RESP-CODES, LOGIN-DELAY, PIPELINING
      
    RFC 2595: Using TLS with IMAP, POP3 and ACAP 
    
        supported: STLS