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   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?

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MicT Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 September 2005 Status: Offline Points: 3	Post Options Post Reply Quote MicT Report Post Thanks(0) Quote Reply Topic: SURBL not active? 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?

MicT Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 September 2005 Status: Offline Points: 3	Post Options Post Reply Quote MicT Report Post Thanks(0) Quote Reply 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.

MicT Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 September 2005 Status: Offline Points: 3	Post Options Post Reply Quote MicT Report Post Thanks(0) Quote Reply 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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SURBL not active?