You can't run two SMTP products on the same machine unless one of them can forward mail to the other one on a non-standard port. Exchange cannot (as far as I know) do that, and the SMTPL "listener" service is strictly a "dumb" SMTP server--it accepts mail only for LISTSERV and for the lists on the machine (it can't relay). Similarly, under NT, if there is no way to get the mail via MAPI from Exchange to LISTSERV in a format LISTSERV understands (the Base64 JOB format you've probably noticed), again, you can't get this to work. And no such "connector" service for Exchange is available, so it isn't possible. What you are doing is the standard way to run LISTSERV when you do not use LSMTP for a true "turnkey" solution (where everything is on the same machine and LISTSERV can run without reliance on a separate SMTP server for outgoing mail). Nathan