Specifies the format of Internet message bodies and the various headers used to describe the structure of MIME messages. http://www.ietf.org/rfc/rfc2045.txt
Defines and discusses the requirements for Internet host software and covers the application and support protocols. http://www.ietf.org/rfc/rfc1123.txt
Describes the widely implemented Simple Mail Transfer Protocol (SMTP) designed to transfer mail reliably and efficiently and relay mail across transport service environments. http://www.ietf.org/rfc/rfc0821.txt
Specifies various IANA registration procedures for MIME media types, MIME external body access types, and MIME content-transfer-encodings. http://www.ietf.org/rfc/rfc2048.txt
Describes the widely implemented Simple Mail Transfer Protocol (SMTP) designed to transfer mail reliably and efficiently and relay mail across transport service environments. Obsoletes RFC 821, 974, 1869. http://www.ietf.org/rfc/rfc2821.txt
Describes the Internet Message Access Protocol (IMAP), which allows a client to access and manipulate electronic mail messages on a server, and permits manipulation of remote message folders. http://www.ietf.org/rfc/rfc2060.txt