[opensuse] Redirecting port 25 to another server

I am using Postfix on SuSE 10.3.
I currently have relayhost set to my ISP, but I would like to
intelligently set up an SSH tunnel to another server based on my email
address:
For instance, when my email address is gaf@xxxxxxx, I want to set up an
ssh tunnel on port 25 to the blu.org server but if my email address is
not gaf@xxxxxxx, or one of the virtual domains, I would just like to go
to the ISP.

I can easily set up a script to set up the ssh tunnel to forward my
localhost port 25 to the blu mail server:
ssh -L 25:blu.org:25


Alternatively, I could redirect all the email through the blu server
simply by removing the relayhost from main.cf, and setting up the tunnel
permanently (or by cron).

So, what I am looking for is:
1. An opinion on whether I should just send all my email out on the ssh
tunnel. or

2. Set up the intelligent postfix script.

I can also set up my mail client to use the ISP directly for outgoing
email on my ISP mail address.

--
--
Jerry Feldman <gaf@xxxxxxx>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB CA3B 4607 4319 537C 5846

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