The IESG has received a request from an individual submitter to consider the following document: - 'SMTP 521 and 556 Reply Codes' <draft-klensin-smtp-521code-05.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2015-04-02. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. 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 file can be obtained via http://datatracker.ietf.org/doc/draft-klensin-smtp-521code/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-klensin-smtp-521code/ballot/ No IPR declarations have been submitted directly on this I-D.
