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SURBL not active?

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5317
Printed Date: 04 November 2025 at 2:53pm


Topic: SURBL not active?
Posted By: MicT
Subject: SURBL not active?
Date Posted: 01 September 2005 at 5:32am

We have been evaluating SpamFilterISP first on a testserver (win XP)on which everything worked great, and have now installed it on our production machine (win 2003) and are testing it on a few domains first.

And it seems to work fine except that the SURBL filter doesn't catch anything although it did on the test server. On the test server we could forward a previously recieved spam mail with a link in it and it would be caught by the SURBL filter. Doing the same on the production server doesn't catch the exact same e-mail. We have also recieved a number of SPAM mails that looks like the filter should catch but hasn't. multi.surbl.org is in the list of SURBL servers and SURBL has not been deactivated on individual domains so it should be active. Other filters like MAPS and reverse DNS works fine.

Is something wrong with our setup or what is going on?


Replies:
Posted By: MicT
Date Posted: 02 September 2005 at 8:37am
I have found part of the solution, and it seems the problem does not lie with SpamFilterISP. The spam filter server doubles as a DNS server and apparently the SURBL DNS queries are not working from that server - although we have not experienced other problems with DNS on that server and MAPS are working. So for now the solution has been to set another DNS server in SpamFilterISP and voila the SURBL filter is working. So now I just need to figure out why the DNS lookup is not working.

Posted By: MicT
Date Posted: 02 September 2005 at 9:33am
Solved. It was a combination of Windows Server 2003 DNS and a PIX firewall that caused certain UDP packets to be dropped. Fixed through a configuration change.


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