Configure the list to use passive probes with a probe interval of 1 day. This will cause the first message of the day, every day (or maybe every other day), to be sent as a passive probe for all subscribers who are not set to NOMAIL. The recipient's email address will be embedded in the envelope-sender address. When the message loops back, you should be able to identify the offender. For additional information on passive probes, see: http://www.lsoft.com/manuals/15.0/listkeyw.html#keyError -- Paul Russell, Senior Systems Administrator OIT Messaging Services Team University of Notre Dame [log in to unmask] On 7/11/2007 09:13, Stephen C. Nill wrote: > Pete, sorry that I didn't mention that I already searched for addresses > from these domains (using various wildcard combinations to make sure). > > At 03:46 AM 7/11/2007, you wrote: >> check for subscribers from: >> >> [Declude.]Interceptor.com >> nozonenet.com >> >> >> At 00:50 7/11/2007 Wednesday, Stephen C. Nill wrote: >> >Colleagues, >> > >> >I have a pesky problem that maybe a set of fresher eyes can help me >> with. When posting to one of our lists, the posting makes it to the >> list just fine, but the following is sent back to the sender: >> >> >> >> >>Return-Path: <[log in to unmask]> >> >>Received: from Declude.Interceptor.com (68.208-100-26.nozonenet.com) >> by charitychannel.com (LSMTP for Windows NT v1.1b) with SMTP id >> <[log in to unmask]>; Tue, 10 Jul 2007 21:44:37 -0700 >> >>Return-Path: <[log in to unmask]> >> >>Received: from charitychannel.com ([216.132.135.170]) >> >> by Declude.Interceptor.com >> >> with hMailServer ; Tue, 10 Jul 2007 23:43:47 -0500 > > > > Stephen C. Nill > Founder & Chief Executive Officer > CharityChannel > [log in to unmask] >