Here is the RFC used in CAMAS.
 (* = Not implemented/Listed for refence only)

MIME Related
------------
 RFC 1873 : Message/External-Body Content-ID Access Type (Experimental)
 RFC 2045 : Multipurpose Internet Mail Extensions (MIME) Part One:
            Format of Internet Message Bodies
 RFC 2046 : Multipurpose Internet Mail Extensions (MIME) Part Two:
            Media Types
 RFC 2047 : MIME (Multipurpose Internet Mail Extensions) Part Three :
            Message Header Extensions for Non-ASCII Text
 RFC 2048 : Multipurpose Internet Mail Extensions (MIME) Part Four:
            Registration Procedures
 RFC 2049 : Multipurpose Internet Mail Extensions (MIME) Part Five:
            Conformance Criteria and Examples
 RFC 2077 : The Model Primary Content Type for
            Multipurpose Internet Mail Extensions
 RFC 2110 : MIME e-mail Encapsulation of Aggregate Documents such as
            HTML (MHTML)
 RFC 2183 : Communicating Presentation Information in Internet Messages:
            The Content-Disposition Header Field
 RFC 2231 : MIME Parameter Value and Encoded Word Extensions:
            Character Sets, Languages, and Continuations
 RFC 2298 : An Extensible Message Format for
            Message Disposition Notifications
 RFC 2387 : The MIME Multipart/Related Content-type
*RFC 2424 : Content Duration MIME Header Definition

SMTP Related
------------
 RFC 2821 : Simple Mail Transfer Protocol
 RFC 2822 : Internet Message Format
 RFC 1344 : Implications of MIME for Internet Mail Gateways
 RFC 2076 : Common Internet Message Headers
 RFC 2476 : Message Submission
*RFC 2505 : Anti-Spam Recommendations for SMTP MTA

IMAP Related
------------
*RFC 2683 : IMAP4 Implementation recommendation
 RFC 2342 : IMAP4 Namespace
*RFC 2180 : IMAP4 Multi-Accessed Mailbox Practice
 RFC 2061 : IMAP4 compatibility with IMAP2bis
 RFC 2087 : IMAP4 quota extension
 RFC 3501 : Internet Message Access Protocol - Version 4rev1
 RFC 3503 : Message Disposition Notification (MDN) profile for
            Internet Message Access Protocol (IMAP)

SMTP Extensions
---------------
 RFC 1652 : 8bit-MIMEtransport
 RFC 1870 : Message Size Declaration
 RFC 1891 : Delivery Status Notifications
 RFC 1894 : An Extensible Message Format for Delivery Status Notifications
*RFC 1985 : Remote Message Queue Starting (ETRN)
*RFC 2034 : Returning Enhanced Error Codes
*RFC 2487 : Secure SMTP over TLS
*RFC 2554 : Authentication
*RFC 2852 : Deliver by
*RFC 2920 : Command Pipelining
 RFC 3030 : Transmission of Large and Binary MIME Messages

Related extensions
------------------
*RFC 2033 : Local Mail Transfer Protocol (LMTP)
*RFC 2142 : Mailbox names for common services, roles and functions
*RFC 2654 : ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP Addresses
*RFC 2789 : Mail Monitoring MIB
*RFC 2369 : List Header Fields helper
