The only messages that result in auto-deletion of the member contain things like, --> Error description: Error-For: [log in to unmask] Alias: [log in to unmask] Error-Code: 3 Error-Text: No such local user. in the body of the mail message. There also has to be a line in the mail header that triggers the code in LISTSERV to look for that info. So, while human mail reading machines :) can tell that any note that says "Invalid userid" is a dead e-mail address, LISTSERV won't remove the subscriber unless the note is in a specific form. It could be that the mail rejections your list owner is seeing aren't being generated by a system that uses the format LISTSERV recognizes. If you'd like to test that theory, try adding an address to the list in question that is on a system that runs LMAIL or PMDF (I don't know what version of of PMDF is required). If LISTSERV removes the address when the delivery error is received then your server is working fine. -jj PS - There may very well be other software packages that generate LISTSERV-edible delivery errors (MX perhaps?). I just mentioned LMAIL and PMDF because I'm aware that they do so.