Quick postfix RTFM question

[gaf at blu.org (Jerry Feldman)]

As I had mentioned earlier, I used to have a mailertable where some domains 
I routed through comcast and others through BLU and others were direct. 

One thing I was curious about is I want to be able to set up a relayhost 
where I deliver email either to smtp.comcast.net or to blu.org depending on 
the destination domain. 

AFAIK: The way to do this in Postfix might to use transport maps. 
An example of what I want to do is below:
Destination			smarthost
comcast.net			smtp.comcast.net
blu listservs			lists.blu.org
default				blu.org (would probably be asgard).

I was just wondering if this would be the best way, or does anyone have 
another suggestion.
-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix user group
http://www.blu.org PGP key id:C5061EA9
PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9