I just revisited the server. The DNS errors show the following in the window for Packets causing problem. These look anything but meaningful to me. I just recognize portions of the test names.
The problem here is with the spam-support.blackholes.five-ten-sg.com database, which is not following the standards. Specifically, it is returning multiple TXT records, where it should only be returning a single TXT record. Worse, the multiple TXT records are causing the size of the packet to exceed the UDP maximum of 512 bytes, causing TCP to be used.
There are over 50 of these starting at midnight.
It seems that this will happen for *some* E-mails that are listed in spam-support.blackholes.five-ten-sg.com.
What confuses me, though, is why Microsoft is choking on this -- BIND doesn't have a problem with it here.
-Scott
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