What is "Virtual Email (for mailboxes and aliases)" (Administrator's Webmin Modules) (second try)

Just curious. I toggle yes/no for:

“Virtual Email (for mailboxes and aliases)”

under:

Virtualmin > System Settings > Server Templates > [my template] > Administrator’s Webmin Modules

And then refresh the page as a logged-in Extra Admin, no difference jumps out at me.

The click-on-it help says:

“Enable this if the domain owner account should have the ability to create, edit or delete new mailboxes and mail aliases.”

I seem to be able to add users and aliases as an Extra Admin fine though.

So what does it do?

SYSTEM INFORMATION
OS type and version 7.40.1
Virtualmin version Ubuntu 24.04