its called a sender policy framework (SPF) here is a good write up on it
http://www.openspf.org/Introduction
http://www.zytrax.com/books/dns/ch9/spf.html
I would make sure that the user is not in someone's personal contact list. I have seen this before. Just because they are removed from Active Directory, that doesn't mean they still can't be in a personal distribution list or contacts...
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