How to Add an MX Record

An MX (or "Mail Exchanger") record is used to identify a host computer as a Simple Mail Transport Protocol (SMTP)/Post Office Protocol (POP3) server. To add an MX record, follow these steps. Note that you must first create the "A" record for the mail server host.

1.    Start the DNS snap-in.       
2.    Click the DNS Server object for your server in the left pane of the console, and then expand the server object to expand the tree.       
3.    Expand Forward Lookup Zones.       
4.    Right-click the zone that you want (for example, example.com), and then click New Mail Exchanger (MX).       
5.    In the Fully qualified domain name (FQDN) of mail server box, type the fully qualified domain name of the host computer that acts as the mail server. For example, type mail.example.com.       
6.    Click OK.