Dave: This makes perfect sense. If you list is SEND=PRIVATE, and the user has multiple e-mail addresses by which they can receive e-mail, but only generate mail from a particular (non-subscribed) address, then this is the result. E.g., today you can e-mail me as [log in to unmask], [log in to unmask], [log in to unmask], [log in to unmask], and [log in to unmask] If I were subscribed to your list as [log in to unmask], and received list distributions perfectly fine, yet I generate mail as [log in to unmask], then my mail TO the list would bounce. You need to provide more precise details: subscriber userid abstracted from your list, bounced mail (or direct mail from the poster). Also interrogate your list's FILTER= to see if any specific or generic addresses. Likewise, issue a LISTSERV command: SERVE userid@host just to be sure that they weren't SERVE OFF due to too many invalid commands. /Pete | |