In article <20150305200224.29517.60563.idtracker@xxxxxxxxxxxxxx> you write: > >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 I have reviewed this draft and think it's just fine. It provides return codes useful with the upcoming null MX RFC, and since null MX is in active use (Google told me today that gmail checks for it), the return codes are likely to be useful, too. R's, John