Re: Blocking port 25 traffic for spam purposes

I kind of like using the following web site to verify that my mail server 
is working.  Have even used it to stop some finger pointing from some 
customers:
http://www.zmailer.org/mxverify-cgi.html

I suppose that might be blocked, eh?  Wait, I just tested it for you and 
it definitely routes through cleanmessage and looks fine.

Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





"Jeff Crosby" <jlcrosby@xxxxxxxxxxxxxxxx> 
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02/10/2004 10:07 AM
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Subject
Blocking port 25 traffic for spam purposes






Since our iSeries is our mail server, I have permission from On High to 
post
this to midrange-l <g>.

We started using CleanMessage to intercept and eliminate as much spam as
possible.  It's working great, stopping 95% of the spam.

The last 5% is spam being sent directly to our IP address instead of
properly using the MX record.

Someone on this list suggested blocking port 25 from all IPs _except_
CleanMessage.  Anyone doing this?  Working OK?  Downside?  I assume only
spammers would be trying to bypass/ignore the MX record.

Oh, and if we do block that port, can a company laptop, via VPN, still
handle email OK?  I'm going to try that from home tonight.

Thanks.

-- 
Jeff Crosby
Dilgard Frozen Foods, Inc.
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531

The opinions expressed are my own and not necessarily the opinion of my
company.  Unless I say so.



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