Rejecting Spammers

[Jethro R Binks]

On Thu, 20 Jul 2006, Rick Chadderdon wrote:

> Anyway, many bulk-mail applications allow you to forge the X-Mailer 
> header.  I wouldn't block on that. Check this out:  
> http://www.silverstones.com/thebat/spammer.html Your call, though.

Well it's worth blocking on the X-Mailer: headers produced by known 
spamming software, of course.  Anyone who forges an X-Mailer header of 
such software deserves everything they get probably!  But you're correct 
that The Bat! is legit and often placed in the X-Mailer: by spammers (I'd 
not seen that web page - very useful).

I haven't checked to see if it gets hit for a quite while, but I have a 
(conservative) list of some of them in my MTA configuration.  I presume 
SpamAssassin will also detect and score some too.

Jethro.

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Jethro R Binks
Computing Officer, IT Services
University Of Strathclyde, Glasgow, UK