Kelson Vibber wrote on Thu, 26 Jun 2003 17:30:07 -0700:
> If someone claims to be your own mail server - and isn't - it's a pretty > safe bet they're up to no good.
That's a rule I use in SA, but unfortunately, I don't know of a way to tell sendmail to do this. It only rejects so-called BOGUS_HELO which seems to only mean it rejects if no HELO/EHLO given at all.
I'm not sure if there's a way to get sendmail to do it alone, but there was a discussion last week on the MIMEDefang mailing list on how to do this with MD's filter_relay function, which runs just after "MAIL FROM" is received. I've seen a huge number of sites using our server's IP as their HELO, and a few using its hostname.
Some sample code: http://lists.roaringpenguin.com/pipermail/mimedefang/2003-June/006199.html
Kelson Vibber
SpeedGate Communications <www.speed.net>
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