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STD 10 contains the following RFCs:
NumberFilesTitleAuthorsDateMore InfoStatus
RFC 821, STD 10ASCII, PDF Simple Mail Transfer Protocol J. PostelAugust 1982Obsoletes RFC 788, Obsoleted by RFC 2821Internet Standard
RFC 974, STD 10ASCII, PDF Mail routing and the domain system C. PartridgeJanuary 1986Obsoleted by RFC 2821Historic (was published as Internet Standard )
RFC 1869, STD 10ASCII, PDF SMTP Service Extensions J. Klensin, N. Freed, M. Rose, E. Stefferud, D. CrockerNovember 1995Obsoletes RFC 1651, Obsoleted by RFC 2821Internet Standard
RFC 1870, STD 10ASCII, PDF SMTP Service Extension for Message Size Declaration J. Klensin, N. Freed, K. MooreNovember 1995Obsoletes RFC 1653Internet Standard

Abstract of RFC 821

The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel. Obsoletes RFC 788, 780, and 772.

Abstract of RFC 974

This RFC presents a description of how mail systems on the Internet are expected to route messages based on information from the domain system. This involves a discussion of how mailers interpret MX RRs, which are used for message routing.

Abstract of RFC 1869

This memo defines a framework for extending the SMTP service by defining a means whereby a server SMTP can inform a client SMTP as to the service extensions it supports. [STANDARDS-TRACK]

Abstract of RFC 1870

This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client's estimate of the message size. [STANDARDS-TRACK]

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.

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