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Setting up a new Front-End Exchange Server

We have a few companies that all use the same Exchange setup.  Right now I am in the process of setting up a second Front-End Exchange server that will be used for the larger of the companies.  I wasn't able to find a good solid best practice scenario for some of my questions, so I wanted to see what the expert's opinions were:

1) Is there any potential problem with having 2 Front-End Exchange servers pointing to the same back-end?

2) Does the computer name on our domain have to be the same as the public A record?  If I have it as FEMailServer on the domain & exchange.domain.com on the public internet.  Also, I want to get an SSL certificate registered in that name too.

3) I want to put it behind my firewall completely, so I need to know what ports I need open to the world.  I plan on doing the following:
- SMTP
- POP3
- IMAP
- Exchange ActiveSync
- OWA
- OMA
- RPC over HTTPS
- What other options are there? =)

4) Are there any articles on other best-practices to consider when implementing a new one?

5) I want to create an SMTP connector in our Exchange Manager to take all email that is coming from a list of domains & send it through the bridgehead of my new FE Exchange Server & then out to our managed security service.  I know how to build the generic portion of the SMTP Connector, but how would I specify only to allow for the certain domains going out it.  

Thanks for your help
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