There are many questions in the NG about what to tell your ISP in order to have email forwarded to your SBS server. Here’s a sample Q&A:
Q: I followed the SBS 2003 setup suggestion, and my internal domain name is called abc.local. I have also registered an Internet domain name xyz.com. I’m now ready to move from external POP3 accounts to an internally hosted Exchange mailboxes. The domain folks are ready to reconfigure the MX record, and they want to know the “name of the server” and it’s static IP address. If the server name is “bubba”, do I tell them to use bubba.abc.local or bubba.xyz.com when creating the MX record? I know this is rather basic, but I have hunted all over and am still confused. Thanks!
A: First, understand that the Public DNS is totally handled by your ISP. You don’t need to change anything on your SBS machine. The public dns name of the computer can be anything you want.
By default you may already have the name “www”, but you should add a second name for mail, such as “mail” or “owa” because it is more typical for owa or pop3 users to access a mail server with “mail” rather than with “www”. MX records refer to an A record on the same dns server.
You basically want an MX record pointing to, for example: mail.xyz.com and then an A record pointing mail.XYZ.com to your public IP address. Or if you wanted to use ‘owa’ instead of ‘mail’, you could have them add two records such as:
MX record = owa
A record = owa 18.104.22.168
The public DNS name you tell your ISP doesn’t have to have any correlation with your private names.
Another response: Set the domain to abc.local as discussed previously. When the installation is finished and you are going through the to do list you will run the connect internet wizard, at that time you will set the server, exchange, to mail.abc.com and create a certificate for that name. The server would answer, internally, to servername.abc.local and externally to mail.abc.com. Your external DNS servers should have a record for mail.abc.com pointing to the external ip address of your router.