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Re: mail proxies, Processing after the end of DATA

2010-08-11 18:32:29

Spam filtering appliances and services sometimes run as, effectively,
proxies rather than store-and-forward MTAs. Postini works in this
way, I think, as do some of the enterprise filtering appliances that
people protect their Exchange servers with.

Yes.  Postini even has a patent on the technique of using callforwards
to provide realtime responses in a spam filtering system, although I
suspect that if they ever litigated it, they'd find it had been
invented multiple times long before they did.

Don't Barracudas also work that way?