- Click on Zone Editor under Domains in cPanel.
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From the Domains table, locate the addon domain name you want to add an MX record.
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Click + MX Record from the Actions column.
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On the Add an MX Record window, in the Priority text box, enter a priority. Lower numbers represent higher priorities. For example, zero (0) is the highest priority.
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In the Destination text box, enter the fully-qualified domain name (FQDN) of the mail server. NOTE: You must enter a FQDN. You cannot enter an IP address.
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When ready, click Add an MX Record.