The fact is that AOL users are very prolific on the internet, and are my biggest bounced email headache. The major email headache is due to the small email box sizes, but mainly, LISTSERV does NOT recognize the AOL bounced email. This is probably due to AOL not properly formatting their bounced email so that listserv can handle it. I've noticed that AOL returns a "551" (full mailbox) and "550" (unknown user) but does NOT include the full email address. Example: 550 johndoe is not a known user How can this be handled? Can listserv be modified to handle these users? Is AOL not sending out proper bounced email messages? Thanks, Jon Eidson ([log in to unmask])