Shutdown PM for all members = how?

[JohanLM]

Been looking around in alot of sections of the adminpanel and I cannot find anything about this.
Goal is to have a strict clean forum, where everything is written in the open aka no email or PM between members is allowed. But I cannot find where to shut it down/off.
I think I been through every section in the Adminpanel but I cannot seem to find it + I have tried some various searchversions in simplemachines.org but have come up with zip, nothing & nada about it.

What am I missing?

[IchBin™]

It's a permission you can change in each member group. "Send personal messages" is what it is titled.

Admin > Permissions > Select the membergroup and disable the option.

[JohanLM]

Ahh ... Ok thank you. Old phpbb2 user and in the system is was an "over all" option and not groupindividual.
Thanks for the quick reply.