Exchange Server Public URL

I have deployed a 2003 Exchange Server that is working properly internally.  I have multiple public IP addresses available.  I need to know how to make Port 80 point to the mail server.  I'm currently using port 80 for a website that I host on a different server.

What are my options to all RPC over HTTP to work properly.  At this time, I'm not using SSL.  I'm using a D-Link DIR-655 Firewall.
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Jamie McKillopIT ManagerCommented:

Do you have a free public IP you can dedicate to the Exchange server? If so, configure your firewall to NAT your Exchange server out as that IP then setup a rule to allow port 80 through.

pcgymAuthor Commented:
I'm not very fluent on the networking side.  Could you explain this in a bit more detail?

Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
At the least, you'll want to allow TCP 25 outbound for Exchange to send Email and TCP 25 inbound to the Exchange server for it to receive Email from the Internet.

If you are using OWA, you'll want to either open TCP 80 (unsecured HTTP) or TCP 443 (secured HTTPS) depending on which service you're running.

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