>Since when are mail messages coming back to listserv telling you >that the mail has sucessfully made it to its destination? >I have never seen this before, but I certainly don't hope its common. Write an e-mail to the postmaster/root at that host explaining how you receive these for list distributions and that it is both a waste of bandwidth and your time to process these. Also imply that if it continues, you will have absolutely no choice but to unsubscribe the user since this is non-standard behaviour for your list participants. /Pete