A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : SMTP 521 and 556 Reply Codes
Author : John C Klensin
Filename : draft-klensin-smtp-521code-07.txt
Pages : 8
Date : 2015-05-01
Abstract:
This memo defines two Simple Mail Transfer Protocol (SMTP) reply
codes, 521 and 556. The 521 code was originally described in an
Experimental RFC in 1995 and is in wide use, but has not previously
been formally incorporated into SMTP. The 556 code was created for
RFC-nullMX. These codes are used to indicate that an Internet host
does not accept incoming mail at all (not just under particular
circumstances).
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-klensin-smtp-521code/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-klensin-smtp-521code-07
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-klensin-smtp-521code-07
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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