On Wednesday, November 26, 2014 09:00:14 PM Wietse Venema wrote: > Postfix snapshot 2.12-20141126 changes the error messages for domains > with a NULL MX record from "invalid DNS reply" to "domain does not > receive mail". > > This also introduces a new SMTP server configuration parameter > nullmx_reject_code (default: 556) and updates the documentation > for reject_unknown_sender/recipient_domain. > > I will upload a minimal patch for older Postfix versions later.
I'm surprised you chose to introduce as a default an undefined code point. RFC 5321 (and its predecessors) have pretty strong language against use of new reply codes and the current IETF draft specifies use of 550 in most cases (521 when a submission server or relay declines to accept mail). See the last part of section 4.1: https://tools.ietf.org/html/draft-ietf-appsawg-nullmx-08 Was there a reason for this? If it really should be it's own reply code, I'd like to get the input into the IETF process before the draft is published as an RFC. Scott K
