Email hosting only

Hi,

Can anyone guide me on how to create a package for email hosting only?
And not permit the user to create a website.

For every account, there is always a domain name and public_html. So by default, they can create websites.
But I am trying to figure out how can they be restricted in creating websites.

Perhaps setting nproc and apache_nproc to 0?

manually, you could chown public_html root:root

manually, you could chown public_html root:root

Let me know if you find a way. I haven't.
Just went with an Email only server like iRedMail.