Mfpitgdav.pl
http://gigo.com/ftp/pub/src/mfpitgdav.pl
Filter for Verisign’s wildcarding of *.net/*.com . This will prevent senders from using bogus “MAIL FROM:” addresses that wildcard resolve to verisign. Easy to extend to other types of wildcarding entities like .cc or .tv. (This is a postfix policy server)