> >> try
> >> X-Mailer: The Bat
> >>
> 
> The Bat is a valid email client that many use in place of 
> Outlook Express. 
> That regex will catch all email sent from people using the 
> Bat client, will 
> it not?
> 
> http://email.about.com/cs/winclientreviews/gr/the_bat.htm
> 
> http://en.wikipedia.org/wiki/The_Bat%21
> 
> "There may be about 30 messages with forged "X-Mailer: The 
> Bat!" headers per 
> 1000 spam messages. Some Internet service providers, being 
> unaware of this, 
> are setting traffic filters that block messages containing 
> "X-Mailer: The 
> Bat!". This forces legitimate users to configure The Bat! to 
> not include 
> X-Mailer field into the messages that they send."
> 
> I don't use it but I thought you should be aware.
> 

Yes and No.  IMHO, with evidence, most people using the bat to send our
companies email are using it to send our clients uce/spam/por*n.  I've yet
to receive a valid email from anyone or any company (several years) that
uses the bat to send email to our clients.  Likewise, I've been know to
filter an entire class C with as little as two ip's that have been rbl'd.
Our email systems traffic is small for just a dozen compaines or so; but our
ammount of uce/spam/por*n is around 80% (excluding several country wide ACL
- class A blocks at the boarder router).

Just as a thought I might just do an analysis on good/bad X-Mailer The Bat!
Emails.. But then again.. 

Tnx

Rick


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