Issue :

Users should not be able to add a particular domain ( say ) as an add-on domain or a parked domain.

Fix :

This can be easily accomplished on a cPanel server by the following steps :

1. Add the domain ( ) to the file /usr/local/cpanel/etc/commondomains
2. Then, ensure that the following Tweak Setting (WHM -> Server Configuration -> Tweak Settings) is enabled:
Prevent users from parking/adding on common internet domains. (i.e.,

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