Maeglin (maeglin73) wrote,

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Creative spam filtering

A while ago, a forum that I'm part of had its membership list swiped by a spammer, and since then there have been quite a few messages sent by said spammer in a half-assed attempt to masquerade as the forum admin. Looking at the email headers makes it easy to tell the two apart, but it gets to a point when it becomes annoying.

The usual measures with these guys wouldn't necessarily do, because:
- Blacklisting the sender, which may even match against the wrong address, might cause SpamAssassin's Bayesian filter to start filtering legit announcements.
- From prior experience, service providers tend to favor their own paying customers when it comes to security or net etiquette issues (in general, ToS violations) and make it difficult for outside parties to get anything done about them (Time Warner Cable, I'm talking to you!).

In light of that, I decided to do things my own way:
220 ESMTP Sendmail 8.14.2/8.14.2; Mon, 5 Nov 2007 13:31:03 -0500
helo localhost
250 Hello localhost [], pleased to meet you
mail from:<>
501 5.0.0 Go away, you dumb fuck

Being a server god has its perks :-)
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