For folks that want to check if an email sender domain is being served by an authoritative nameserver, don't have sendmail, and have SpamAssassin, I've submitted patches to the SpamAssassin project to add this check.
For those interested in adding this, the SA bug link is:
http://bugzilla.spamassassin.org/show_bug.cgi?id=2432
Thanks, Devin Nate
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Devin Nate
Chief Consultant & General Manager
BridgeComm Corporation
http://www.bridgecomm.net/
mailto:devin.nate@bridgecomm.net
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