Help with Exchange 2007 and Network Setup

We currently run Exchange 2003 and we use a smarthost to send e-mail and a pop3 downloader to receive e-mail.  We're also using GFI Mail Essentials and Trend Micro Scanmail as spam detection.  We use AD and DNS on our internal network.

I really want to get rid of the pop3 downloader and smarthost.  We're currently in the planning process of upgrading to Exchange 2007 (We'll go live after SP1).  Here is my question.

What is the best way to set up an exchange 2007 server to send  and receive e-mail without using a 3rd party resource?  

Do i need to make any changes in DNS or anything like that?  I already know about opening up port 25 on our firewall and setting the MX record for incoming e-mail.  I just want to make sure i don't miss anything.  I want to make sure that we stay secure and not allow any spam out of our network as I have no desire to be blacklisted.  I have the option of using other servers, if i needed them.  

Thanks for all the help.  I really appreciate it.
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SembeeConnect With a Mentor Commented:
You don't need Exchange 2007 to get rid of the POP3 connector.
All you need is a static IP address. You can then get the MX records pointing there and email delivered directly. I would suggest that you do that first, before you even consider the upgrade.

This is my guide to DNS config for an Exchange server:


If your question has been answered, please remember to accept the answer and close the question.
sbockAuthor Commented:
Oh, i know that we don't need exchange 2007 for just the pop3 connector.  We want to upgrade for many reasons.  I just want to stop using the connector when we make the switch.
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