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This does not happen to all incoming email, just enough that legitimate emails are occasionally blocked. I started going through the security log testing every one of these and I find about a dozen a day (out of 80,000 incoming connections a day) which appear to resolve. To test, on the server KMS is running on I do a nslookup of the domain SOA, verify that MX records exist, and check the PTR record for the incoming email source IP. All of these tests pass yet the email is rejected as "sender domain does not resolve".

What am I missing?

Server is Windows 2003 with all current patches, and is our external DNS server as well.
KMS is version 6.3.0 build 2132.

Steve Ribble
Gazette Communications

Steve Ribble
Mgr. of System Administrators
Gazette Communications
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