add the header * FILTER= ALSO,*postmast*@* This solves most of the usual "bounces" back to PUBLIC lists. Other "spamming" userids can be added. But this will solve your immediate problem. While you are at it, try to determine which list subscriber at upenn.edu is (in)directly causing mail to bounce e.g., Q list FOR *@*.UPENN.EDU then "nuke 'em" Also, you should feel to complain to [log in to unmask] about their not respecting the "RFCs" on such matters. As far as I can tell, you're real lucky that a mail loop did not occur. -- co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L [log in to unmask] "No joyriders on the Info Super Hiway!"+1 814 863 1843 31 Shields Bldg. -- Penn State Univ -- University Park, PA 16802-1202 USA