Thanks for your help, Theo Van Dinter! Using your tip, I was able to find this on a web site here:
http://cpan.uwinnipeg.ca/htdocs/Mail-SpamAssassin/Mail/SpamAssassin/Util/RegistrarBoundaries.pm.html (which I post in cause someone in the future stumbles upon this thread looking for this same answer but doesn't have SA source code handy) Thanks again! Rob McEwen PowerView Systems [EMAIL PROTECTED]