Exchange 2003 Setup with Another Email Server at Home

I would like to be able to test out an Exchange 2003 setup on my home network that I host some small domains.  I currently have a server with a mail server on it which works fine but would like to offer OWA etc.  So, here's my setup and I hope someone can advise.

Cable connection to my home
Microsoft router that routes port 25 to my mail server
Mail server (Mailenable)
Exchange 2003 server on another machine

I would like to have's mail hosted on the Exchange server so I can test it but I don't want to interrupt's email on Mailenable's server.  So, I would like the email to be routed to either server depending on the domain coming in.

I've tried other newsgroups but they are talking to me like I know Exchange quite well, but I'm just starting out, so any help would be great.

Who is Participating?
One server has to be the first point of contact for the email.
I don't know if mail enable can forward email for another domain to another server en-masse, but I know I can get Exchange to do it. I have the process documented on my web site:

mikeyatsonyAuthor Commented:
I noticed that my Mailenable server was too secure and was blocking the messages from Exchange.  I had it setup properly before just forgot to check the log files.  VERY important to find out what's going wrong.

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