smart host using postfix?

[aphro@portal.aphroland.org]

hi

i know sendmail a lot but not postfix very well. on a few machines
i am running postfix because it seems easy to get it to bind to
only 1 or 2 of the interfaces on the system, i don't want a smtp
running on all interfaces.

but i cant find info in the config files for postfix on how to
relay to a hub (or in sendmail terms, a "smart host") instead of
attempting delivery directly. running a grep for "hub" and
"smart host" come up with nothing, so i imagine the term postfix
uses is different ..I can't imagine postfix wouldn't support
something like this so if someone knows the config variable to
set i would appreciate it!!

thanks

nate