DNS question, null MX records

Paul Vixie vixie at isc.org
Wed Dec 16 18:48:00 CST 2009

Douglas Otis <dotis at mail-abuse.org> writes:

> If MX TEST-NET became common, legitimate email handlers unable to
> validate messages prior to acceptance might find their server
> resource constrained when bouncing a large amount of spam as well.

none of this will block spam.  spammers do not follow RFC 974 today
(since i see a lot of them come to my A RR rather than an MX RR, or
in the wrong order).  any well known pattern that says "don't try
to deliver e-mail here" will only be honoured by friend people who
don't want us to get e-mail we don't want to get.
Paul Vixie

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