last updated : 2010-05-26

5321 Simple Mail Transfer Protocol J. Klesin
      (Obsoletes RFC 2821, Updates RFC 1123, Published 2008-10)
      (Status: Draft Standard)

2821 Simple Mail Transfer Protocol. J. Klensin, Ed.. April 2001.
     (Format: TXT=192504 bytes) (Obsoletes RFC0821, RFC0974, RFC1869,
     STD0010) (Status: PROPOSED STANDARD)

    1869 SMTP Service Extensions. J. Klensin, N. Freed, M. Rose, E.
         Stefferud, D. Crocker. November 1995. (Format: TXT=23299 bytes)
         (Obsoletes RFC1651) (Obsoleted by RFC2821) (Also STD0010) (Status:
         STANDARD)

        1651 SMTP Service Extensions. J. Klensin, N. Freed, M. Rose, E.
             Stefferud, D. Crocker. July 1994. (Format: TXT=22153 bytes)
             (Obsoletes RFC1425) (Obsoleted by RFC1869) (Status: DRAFT STANDARD)

        1425 SMTP Service Extensions. J. Klensin, WG Chair, N. Freed, Ed., M.
             Rose, E. Stefferud, D. Crocker. February 1993. (Format: TXT=20932
             bytes) (Obsoleted by RFC1651) (Status: PROPOSED STANDARD)

    0974 Mail routing and the domain system. C. Partridge. January 1986.
         (Format: TXT=18581 bytes) (Obsoleted by RFC2821) (Also STD0010)
         (Status: HISTORIC)

    0821 Simple Mail Transfer Protocol. J. Postel. August 1982. (Format:
         TXT=124482 bytes) (Obsoletes RFC0788) (Obsoleted by RFC2821) (Also
         STD0010) (Status: STANDARD)

        0788 Simple Mail Transfer Protocol. J. Postel. November 1981. (Format:
             TXT=109001 bytes) (Obsoletes RFC0780) (Obsoleted by RFC0821, STD0010)
             (Status: UNKNOWN)

            0780 Mail Transfer Protocol. S. Sluizer, J. Postel. May 1981. (Format:
                 TXT=80352 bytes) (Obsoletes RFC0772) (Obsoleted by RFC0788, STD0010)
                 (Status: UNKNOWN)

                0772 Mail Transfer Protocol. S. Sluizer, J. Postel. September 1980.
                     (Format: TXT=61061 bytes) (Obsoleted by RFC0780, STD0010) (Status:
                     UNKNOWN)