Of all the gin joints in all the towns in all the world, Richard Irving had to walk into mine and say:

Agreed, but nothing -requires- an MTA Agent have an MX record, in the first place.... it is just a best CBP. Not having one means you don't comply with ALL the RFC, but you are still RFC compliant. Not the same thing, FWIW.

As part of continuing escalations in the war on spam, some MTAs are now refusing to *accept* mail when the sender's domain does not have MX records defined. Whether this is a *wise* decision is becoming unimportant; people are doing it. -- Harald Koch <chk@pobox.com>