The following error delivery notice caused a mailing loop on JHUVM's Listserv over the weekend. I've send a note to the postmaster at att.com and att.att.com asking for their cooperation in developing a way to stop future occurences of this problem. If any of you have mailing lists which utilize the att.att.com gateway machine, keep an eye on them. I don't know if this is a newly implemented format for mail delivery errors, or if the conditions that cause it to be used are rare. Listserv eventually caught the loop once the "From:" line mutated to [log in to unmask] (it was xxuucp and inuucp at various times during the loop). Since the original posting wasn't included in the error message and the "Subject:" is innocuous, the mail got passed all the triggers. -jj -------- sample error message from att.att.com follows: Received: by JHUVM (Mailer R2.08 PTF008) id 8028; Sun, 12 Apr 92 13:38:37 EST Date: Sun, 12 Apr 1992 13:32:00 EDT Reply-To: 4ad recording artists list <[log in to unmask]> Sender: 4ad recording artists list <[log in to unmask]> From: [log in to unmask] Subject: UUCP Mail To: Jim Jones <[log in to unmask]> UUCP request att!D.att6dc2fe2 to emsp!D.att6dc2fe2 failed on system 'emsp'. Reason for failure: remote system can't create temp file remote file system is low on free space