Collate LISTSERV's log with SMTP's. Depending on source routing, you might need to then pursue at another host. One of my "favorites" is when a incorrectly configured MTA neglects to append the HLQF to a host name. LISTSERV then likes to think of this as a Bitnet node. Subscribes the person, then it bounces, and auto-deletes. (I think this is a form of listserv-selfabuse). Using 'confirm= yes' only helps slightly in that scenario. [log in to unmask]