i'm missing my copy of "why a wildcard MX won't help sitefinder"

at the meeting yesterday, verisign said they were considering the benefits
of a wildcard MX RR whose target was a nonexistent name, as a way to keep
smtp traffic from having to come to sitefinder for rejection.

i recall a very good posting on this topic and i think it was on nanog but
i can't find it now. can someone privately send it to me if you've got it?