On Tue, Nov 08, 2011 at 12:41:20PM -0500, Robert P. J. Day wrote: I'm not a wizard, but: > No configuration > Internet Site > Internet with Smarthost > Satellite system > Local only Internet Site means mail is received from outside the machine (and from inside the machine). Mail is sent directly to the MX of the domain you are sending to. Internet with Smarthost means mail is received from outside the machine (and from inside the machine), but you send outgoing email to a single MTA (probably your ISP's MTA) for forwarding on to the final destination. Satellite means all mail is handed to an MTA on another system for delivery. You probably don't want this, or apps/daemons that want to mail to root@localhost will have trouble contacting you. You probably want Internet with Smarthost, from your description. bjb