On 12/16/09 4:48 PM, Paul Vixie wrote:
Douglas Otis<dotis@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.
Agreed. But it will impact providers generating a large amount of bounce traffic, and some portion of spam sources that often start at lower priority MX records in an attempt to find backup servers without valid recipient information. In either case, this will not cause extraneous traffic to hit roots or ARPA. -Doug