According to the information supplied at ' Task Wizard: Configure automatic deletion of invalid e-mail addresses on clicking the ? (question mark) it says towards the bottom of the page "Note that if you have coded "Delay(0)" and/or "Max(0)", LISTSERV simply deletes any error-generating subscriber it can (generally 95-98%), discards any further errors it does not understand, and does not generate daily monitoring reports. " I have a 16,015 list that is set as:- Auto-Delete= Yes,Full-Auto,Delay(0) Two emails have been sent. Postmaster (errors-to) has received hundreds of '550 user unknown', but not a single person has been removed from the list. It is still at 16,015. ??? Regards...Martin