When a cPanel hosting account is initially created it is configured to handle mail for the given domain by default.
This means cPanel assumes it will act as a Post Box for your domain. It will accept mail for the configured mailboxes and forwarders allowing you to use IMAP or POP3 to collect mail. If you wish to have your mail handled by external providers such as Microsoft Exchange or Google Apps then changing the MX records for your domain is appropriate.
- Login to cPanel using the username and password you have been provided
- Go to the Email Window and select the MX Entry icon
- Locate the 'MX' records and change them to meet your requirements
- Under Email Routing, choose the option "Remote Mail Exchanger" (this tells cPanel not to not deliver mail locally)
- Save your settings