I appreciate your thoughts, but I turned to WebMin/VirtualMin precisely because I don't spend enough time in Linux to be completely comfortable managing every server application at the terminal, even though I am otherwise aware of general administrative needs and procedures. The hope was that it would help me manage Postfix, sendmail, LDAP, user management, various webmail daemons, Apache, SpamAssassin, WordPress, SSL Certificate management, etc., without having to remember or cheat sheet everything. To an extent it does that, but very imperfectly. Without it, there's a huge nut to crack, as evidenced by a ridiculously long primer on setting up a personal mail server that Ars Technica recently featured.

There's no real reason a Linux mail server should be an order of magnitude more difficult to administer than an Exchange server. But without VirtualMin or something like it, it is. (There's a damn good reason that CPanel gets away with charging as much as it does.)

I don't particularly care if I lose massive geek points saying it and trying to rely on the server side tools, but I'm quite sure there are others like me who are otherwise competent but don't yet have the shell wizardry to go bareback.

Again, thanks for the feedback.