Restricting Users’ Access to Other Users’ DNS Zones

By default, users can create new subdomains and domain aliases in the
DNS zones belonging to other users. This means that they can set up
websites and email accounts which could be used for spamming, phishing
or identity theft.

To prevent users from setting up domains and domain aliases in the
DNS zones belonging to other users:

1. Go to Tools & Settings > Server Settings.
2. Select the Forbid users to create DNS subzones in other users’ DNS
   superzones checkbox.
3. Click OK.