Microsoft Exchange 2010 FQDN Newbie

I would like to use Outlook Web Access and have it access the internet for clients to use outside of my domain.  I am new to OWA and FQDN issues.  I would like to know how I register a new “A host” record with exchange.  Is this done on local DNS or external DNS?  This is my very first Exchange install and I’m sure I’m unaware of critical prerequisites after the initial install of Exchange 2010 (all pre install prerequisites have been met).  I’m currently running Exchange 2003 and 2010 in coexistence mode.  It seems like 2010 is very close to being stood up but I know I’m missing something simple…  I have a hunch its due to FQDN issues…

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suriyaehnopConnect With a Mentor Commented:
Basically, you have to do on both local and external dns. For external dns, it will allow people from outside to send an email to your exchange server. Normally, you must host your email domain name at godaddy, they will create an account to manage your domain name. You need to create a Host record and then MX records. This MX records will have public IP address. The public IP address is your firewall's IP facing Internet. On firewall, you need to do NAT to your exchange IP address.
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