External IP and Firewall Configuration for Exchange 2010

Hello, I have just finished installing exchange 2010 in my Exchange 2003 environment. Since we only have a single exchange server environment, and a single static IP. How do I ensure internal, but more importantly, external connectivity? We have a sonic wall router, and I need to make sure that mail delivered goes to the correct server. Some mailboxes will be on 2003for the time being, some on 2010. I need to ensure auto discover, activesync, and outlook anywhere works. I should also note that all email is filtered through mxlogic, how do I make sure email is delivered to the correct place? Thank you!
indigo6Asked:
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mat1458Connect With a Mentor Commented:
I see two possibilities for you:

The easier one is to buy a second static IP address for your second mail server for the time you need it.

The more complicated one is to find a mail relay service that allows you to send all your  email to a non-standard port (other than 25). you might look up http://domainmx.net/port25.shtml or http://www.no-ip.com/services/managed_mail/outbound_port_25_unblock.html.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Look i guess as Exchange 2003 was in place so emails would be getting already routed to it ..... you will have to change Firewall rule to point to Exchange 2010 server for Sending\Receiving emails

- Rancy
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Jian An LimConnect With a Mentor Solutions ArchitectCommented:
I think it is up to how you plan it.

first thing is whether there is an outage required.

1. do anyone use OWA externally if yes, with your single IP address, you will need to advise end user.

2. test sending email between exchange 2003  and exchange 2010. Will email flow correctly?

3. setup your exchange 2010 to accept internet email and send internet email
http://technet.microsoft.com/en-us/library/bb738138(v=exchg.141).aspx

4. confirm your OWA work internally, confirm certificate name match your domain name.

5. do the Switch over of IP address from the firewall (point them to exchange 2010)

6. do testing against it.
https://www.testexchangeconnectivity.com/ is the way to confirm outlook anywhere work.

7. if good, then keep it, or else, switch over the IP address back to exchange 2003.


then post your problem here :)
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indigo6Author Commented:
We use MXLogic, that alternate port trick will be interesting.
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