Here's a good way to block lots of SPAM (Score:4, Informative)
by TheFlu (flu@SLAMTHESPAMthelinuxpimp.com) on 03:36 PM -- Friday January 25 2002 (#2903411)
(User #213162 Info | http://www.thelinuxpimp.com)
Add the following to your sendmail.mc file:
Works for me...doesn't block it all, but it seems to help a great deal.