Defines and discusses the requirements for Internet host software and covers the application and support protocols.

Defines a portion of the Management Information Base (MIB) for use with network management protocols, and extends the basic Network Services Monitoring MIB to allow monitoring of Message Transfer Agents (MTAs).

Defines a framework for extending the SMTP service by defining a means whereby a server can inform a client as to the service extensions it supports.

Describes the Enhanced Mail System Status Codes, a set of status codes for reporting mail system errors and delivery status notifications.

Describes the widely implemented Post Office Protocol (POP), which allows a client to retrieve mail that a server is holding for it.

Describes the Local Mail Transfer Protocol (LMTP), for transporting mail into a system where a mail receiver does not manage a queue.

Specifies the format of Internet message bodies and the various headers used to describe the structure of MIME messages.

Defines the general structure of the MIME media typing system and defines an initial set of media types.

Describes extensions to RFC 822 to allow non-US-ASCII text data in Internet mail header fields.

Specifies various IANA registration procedures for MIME media types, MIME external body access types, and MIME content-transfer-encodings.

Describes MIME conformance criteria as well as providing some illustrative examples of MIME message formats.

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.

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.

Describes the widely implemented Simple Mail Transfer Protocol (SMTP) designed to transfer mail reliably and efficiently and relay mail across transport service environments.

Specifies the syntax for Internet mail text messages.

Describes how mail systems on the Internet are expected to route messages based on information from the domain system.