On Fri, 12 Mar 1999 06:29:34 -0500, Peacenet Balkans Desk <[log in to unmask]> wrote: >Return-Path: <owner-ZAMIR-CHAT-L*<username>**IGC*[log in to unmask]> > >Is the Return-Path with the inserted username normal, or does it mean >there's a problem somewhere? > This is the LISTSERV 1.8d 'Passive Probe' feature at work. A certain portion of regular list traffic is sent out each day with these 'mangled' Return-Path lines, which has the users 'address-as-subscribed' encoded in it. This is really the RFC821 MAIL FROM:<owner-ZAMIR-CHAT-L*username**IGC*[log in to unmask]> which is used to deliver a single-recipient mail. If the address bounces (is returned to LISTSERV) then LISTSERV can take immediate auto-delete action and know exactly who is the affected non-subscriber to be.