グレーのバックは、後発のRFCにより廃棄されたことを示す。

(原典:rfc-index.txt, std-index.txt

STD0053 : Post Office Protocol - Version 3
RFC1939 Post Office Protocol - Version 3 J. Myers
M. Rose
Obsoletes RFC1725
Updated by RFC1957
RFC2449
May 1996 TXT=47018 bytes STANDARD
RFC1725 Post Office Protocol - Version 3 J. Myers
M. Rose
Obsoletes RFC1460
Obsoleted by RFC1939
November 1994 TXT=35058 bytes STANDARD
RFC1460 Post Office Protocol - Version 3 M. Rose Obsoletes RFC1225
Obsoleted by RFC1725
June 1993 TXT=38827 bytes DRAFT STANDARD
RFC1225 Post Office Protocol: Version 3 M.T. Rose Obsoletes RFC1081
Obsoleted by RFC1460
May-01-1991 TXT=37340 bytes DRAFT STANDARD
RFC1081 Post Office Protocol: Version 3 M.T. Rose Obsoleted by RFC1225
Nov-01-1988 TXT=37009 bytes UNKNOWN
RFC1957 Some Observations on Implementations of the Post Office Protocol(POP3) R. Nelson UpdatesRFC1939
June 1996 TXT=2325 bytes INFORMATIONAL
RFC2449 POP3 Extension Mechanism R. Gellens
C. Newman
L. Lundblade
Updates RFC1939
November 1998 TXT=36017 bytes PROPOSED STANDARD