OWA 2003 with Multi-Domain Login Sites

OK. This may be a bit confusing to explain but here goes…

Have one Exchange 2003 server running on SBS 2003. 8 domains are running sites and emails from this server.

I want to be able to use OWA for each domain individually as follows:

mail.domain1.com
mail.domain2.com
mail.domain3.com
etc.

Currently I can access all OWA user mailboxes by going through mail.domain1.com/exchange

This is really frustrating because the tech who first registered domain1 didn’t think of typing it daily…it’s about 35 characters long… YUCK!

What options do I have in going with multi mail.domain.com sites for owa?

Please let me know if I didn’t explain this sufficiently.

Thanks!

Ted