hello,
I had to upgrade an old installation of postfix with a new one.
The new server has zimbra, there is also a new groupwise 7 server that
only management people will be using.

My goal is as follows:
do some sort of transport_map on a per user basis that will send emails
for that specific user to the novell groupwise server.
The rest of the users will stay on zimbra.

So, I've done some research on the web for this and I've found mixed
results.

You can use alias maps or transport maps. I'd like the emails to go
directly to the novell server without having to be relayed to the
outside (internet) just to come back in.

Both the novell server and the zimbra server have their own public IP
addresses and MX records.
I don't want to put the novell server available to the public (via
smtp) because it's spam protection stinks! I'd like to use postfix to
provide all the emails to the novell server as well as receive mails
for the local domain (lets call it zimbra.org).

I can change the MX records of the novell server if needed.

So, my idea is as follows - please correct me or give me better ideas
if you can.

Make the zimbra (postfix) server receive mail for the zimbra MX record
and the novell MX record.
use transport maps to send copies of mail to specific users on the
novell box.

the zimbra server recieves mail for zimbra.org domain and
novell.zimbra.org domain. I'd put the novell.zimbra.org domain on
relay_domains parameter.

What I can't find is how to make it relay per user?
I've read the book of postfix a few times looking for this and I can't
find it. It's got alias for per user stuff but not transport. I've
looked on the web too but can't find clear details.

Thanks,