Modifying Addon Domain’s DNS records in cPanel

To edit a zone file record in cPanel, go to Zone Editor under Domains. Find your addon domain, click Manage, then Edit the desired record in Zone Records. Make necessary changes and save by clicking Edit Record when done.

To add an MX record in cPanel, navigate to Zone Editor under Domains. Locate your addon domain in the table, then click + MX Record. Enter Priority (lower values higher), and the mail server's FQDN. Finally, click Add an MX Record to complete the process.