jimp,
just wanted to let you know,the two rule example you provided for blocking all outbound port 25 traffic,other than the actual mail server did the trick.
we are no longer getting black listed on spamhaus. i am still running virus stuff on all the workstations,and as stated before,i do not see anything obvious in the states,as one source to many destinations connections.
i even tried doing tcpdumps and watching and can not track down A pc,in particular,
Thanks again for the help!
Take Care,
Barry