Messages in this thread |  | | Date | Mon, 02 Sep 2002 19:53:58 -0700 | From | "Kevin P. Fleming" <> | Subject | Re: [ot] Re: Stupid anti-spam testings... |
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Matt Bernstein wrote: > > Anyway I think this kind of paranoia is just silly. It's trivial to forge > a valid sender address, so why bother checking anything other than a > syntactically valid domain name? >
Because, believe it or not, most spammers don't bother. The main server that I maintain (_NOT_ where I receive L-K) drops at least 20 messages a day at RCPT TO: time using this very check. Considering that's 50% of the spam we drop at RCPT TO: time, I'd say it's worth it.
But I do agree, the systems doing the callouts should cache the results (I'm an Exim 4.10 user as well).
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