Hi, thanks for your reply
I do know how to setup the virtuser table with Sendmail (although I've been tossing around the idea of switching to qmail).
I always assumed that in large virtual-hosting situations where, say, a hosting company will use a control panel like Plesk/CPanel/etc., when you go to "add user" in the control panel you are in fact creating a Linux user a la "useradd" command?
Are you suggesting that what the control panel is really
doing is simply creating a virtual user in the [smtp-server/mta]?