I just want to make sure I understand your response. So if I have one MAIL file with 50 subscribers, and within the MAIL file there is an invalid address or blocked addresses. Will the program deliver the rest on that particular MAIL list, or will it fail because one of the addresses on the MAIL list failed? Is LISTSERV automatically collecting the invalid addresses and returning to the SPOOL directory as another MAIL file or returning the original as an undeliverable? Should I get a message on the Log files indicating that this happened?