2nd domain forwarded to 1st domain.

[nulldev]

I'm working with 2 domains and I want all the mail of one domain be forwarded to another domain. I can't seem to figure out how to accomplish this on Exchange 2k. I found how to accept mail for a second domain but nothing about forwarding it.

Here is an example of what I'm trying to do.

123.org - primary domain
123.com - secondary domain

forward all mail that comes in to the 123.org domain.

Thanks for your help.