> > Ned, by "disable MX lookups", do you mean "don't put MX records > into the DNS zone and therefore force a fallback to the address > records" or "ignore the requirement of the standard that > requires using MX records if they are there"? If the latter, > the behavior, however useful (or not) is, IMO, so far outside > the standard that it is irrelevant to any discussion about how > DNS records are used in a standard way. > > Keith, what do administrative domains have to do with this? I can imagine wanting an option to skip MX record lookup for relaying mail within an administrative domain - if, say, all of the relevant domains within that administrative domain were known to have A records pointing to their inbound SMTP server. By contrast, I have a hard time imagining a good reason to skip MX lookup for relaying mail from one administrative domain to another. (unless maybe there is a bilateral agreement between the source and destination domain that specifies how such mail is to be relayed.) (I have no doubt at all that people ask for such a thing, but I am at a loss as to why such behavior should be blessed by the standards.) Keith _______________________________________________ IETF mailing list IETF@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf