The IESG has tentatively approved the following document: - 'A "Null MX" No Service Resource Record for Domains that Accept No Mail' <draft-ietf-appsawg-nullmx-08.txt> as Proposed Standard Changes to the document late in the review process have resulted in the addition of a downward reference to RFC 1846, which is an Experimental document. This extra Last Call is specifically to ask for comments on whether that downward reference is appropriate. 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 2014-08-25. 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 Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a fallback. Unfortunately this means that the A/ AAAA record is taken to be mail server address even when that address does not accept mail. The no service MX RR, informally called null MX, formalizes the existing mechanism by which a domain announces that it accepts no mail, without having to provide a mail server, which permits significant operational efficiencies. The file can be obtained via http://datatracker.ietf.org/doc/draft-ietf-appsawg-nullmx/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-ietf-appsawg-nullmx/ballot/ No IPR declarations have been submitted directly on this I-D.
