Spam Filter

[Craig Daters]

>You are obviously on top of the situation, Craig.  It sounds like you have a
>first class system going there.  I just wish all sysadmins would take the
>time to plan that well! 
>
>The only reason I replied to your message was to point out this "gotcha" that
>can happen if you use a challenge/response system.  My message and your reply
>will end up in the archives where hopefully other admins will discover the
>information.

Thanks Barry, I was a little nervous when I implemented it, but I 
have to say that I am real proud of my mail server, small though it 
may be. We only have it serving 18 email addresses, for a total of 
about 16K (16,000) emails a month where about 99% of all the spam 
gets caught and quarantined. (about 20% of the 16,000 is spam)

Your comment above regarding sysadmins is the number one reason why I 
moved away from using RBL's directly with Sendmail and into 
implementing the solution I mentioned earlier. We were getting more 
and more false positives popping up, and a little investigation 
proved that in most instances, it was because the RBL maintainer was 
blacklisting entire netblocks as opposed to using only offending IP's 
(with seemingly total disregard.)

Craig D.
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Craig Daters (craig at westpress.com)
Systems Administrator
West Press Printing
1663 West Grant Road
Tucson, Arizona 85745-1433

Tel: 520-624-4939
Fax: 520-624-2715

www.westpress.com

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