Cyrus and Postfix on separate machines -- how?

[Rich Wales]

I currently have both Postfix (2.3.5) and Cyrus (2.3.9) running on
a single server.  Postfix does its thing (including spam and virus
filtering) and then invokes Cyrus's "deliver" program to deliver
messages.

I would like to move my Cyrus onto a separate system from my Postfix.
The reason is because I'm having problems with my Cyrus and want to
try setting up a new version of Cyrus (2.3.10) on a different platform,
but I would prefer to keep my working Postfix setup where it is for now.

What's confusing me here is that I'm not sure how to configure Postfix
so it can deliver a message over my LAN to a separate Cyrus server,
instead of delivering it over a Unix-domain socket to Cyrus running on
the same box.

Any suggestions?

-- 
Rich Wales      ===      Palo Alto, CA, USA      ===     richw at richw.org
http://www.richw.org   ===   http://en.wikipedia.org/wiki/User:Richwales