If you are changing the mail host of a domain already configured on your cPanel server, you will need to change the email routing so that mail is sent to the correct server.
- Log into the user's cPanel account.
- Click the "Email Routing" icon.
- Select the domain name from the "Domain" dropdown menu.
- Select the "Local Mail Exchanger" or "Remote Mail Exchanger" option.
- Click the "Change" button.