CPanel normally does not accept mail for a domain unless the machine running CPanel is the most-preferred MX record for the domain.
To configure CPanel to accept mail for a given domain even if the MX records point at CanIt, perform the following actions.
- Log on to CPanel
- Go to Home >> Mail >> MX Entry
- Select the desired domain
- Configure Email Routing to read Local Mail Exchanger
More information is available from https://documentation.cpanel.net/display/ALD/MX+Entry