This is great. I didn’t realize I had a couple of things wrong with my DNS configuration – particularly regarding safe and trusted email configuration on my home email server.
My friend and coworker Keith “King Cobra” Combs blogged about this site: www.DNSreport.com, which very quickly runs through a gazillion tests** and returns the results, with suggestions on how you can fix any errors or warnings that it finds.
I’ve since fixed the minor problems that it found.
** “Kevin… I’ve told you a million-bazillion times: Don’t exaggerate!”
Absolutely Full of I.T. 
Don’t gorget about the sister site http://www.dnsstuff.com. Between these two sites they have helped me identify numerous issues with DNS setups very quickly and before they caused me some serious problems.
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Yea, dnsstuff.com is kewl too but most of the tests there are run easily enough using nslookup and other standard command line tools. They are both keepers under my browser favorites.
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