Going back through old mail, I found the letter attached below, regarding looping mail between a LISTSERV list and a userid in the .UK domain (we all know of the friendly english mailers, huh ? >:) ) In this site's case, all bounced mail comes from a specific userid (FAILREPTER) so serving off this userid would break any loop from PHOENIX.CAMBRIDGE.AC.UK. Now the question is: do other .UK sites have similar mechanisms ? (Then, perhaps we can add a fixed list of served off userids to a sysvars file) Or better yet, is this all still necessary ? (Perhaps Eric has already done his magic on the incoming mail parser and no more bounced .UK mail loops) Juan ----- Forwarded Mail Follows ----- Date: Thu, 29 Mar 90 15:54:28 BST From: Ken Warner <[log in to unmask]> To: postmast@TECMTYVM, scheutje@HWALHW50 Subject: looping LISTSERV discussion Message-ID: <[log in to unmask]> We (PHOENIX.CAMBRIDGE.AC.UK) recently rejected a large amount of mail sent on the POLYMERP list to our user CJGP, who is away. Our failreports used the 'Sender:' information from the received mail, which is the correct approach. Unfortunately because of an incorrectly configured LISTSERV somewhere it seems that our failreports were broadcast to the list. [log in to unmask] sends ONLY fail reports. It is entirely reasonable to configure individual LISTSERV systems so that this username cannot broadcast to a list, if that is the only means available for breaking the loop. Ken Warner - PostMaster.