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I am getting "The DNS test failed" when doing a DNS Blacklists tests on GFI Mail essentials 12 with Exchange 2003. How do I fix it?

I am getting "The DNS test failed" when doing a DNS Blacklists tests on GFI Mail essentials 12 with Exchange 2003.  It had been working all along.    I added a few more blacklists and the tests were good initially.  All of a sudden the tests started to fail. . .  How do I fix it?  thx.  
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wang0162
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wang0162
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1 Solution
 
Hypercat (Deb)Commented:
This indicates some change or problem on the part of the organization that runs the RBL website.  You'd have to contact whoever is running that RBL and find out if perhaps they have changed the URL for blacklist checking.  Or, perhaps they have been taken down completely.  Which ones are failing?
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wang0162Author Commented:
The challenge is that they all state "Enabled" for each of the blacklists name.  I will try to delete them all and try to re-add one by one. .
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wang0162Author Commented:
Looks like this is the culprit:  t1.dnsbl.net.au  thanks!
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Hypercat (Deb)Commented:
Just a followup comment for future reference - just because they say "enabled" in GFI doesn't mean they actually work correctly. RBL lists come and go, and some are more reliable than others.  I tend to use just one or two consistently that I know work.  The ones I use for the most part are: relays.ordb.org and bl.spamcop.net.  If you use just the most reliable ones, you only need the one or two, and the others are redundant.

Cheers!
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f00eyCommented:
my surbl listings were failing, me11 and exchange 2k3....this server was also a dns server...I cleared the cached within the dns server and bingo, no more dns failed tests....
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