Thread:Project:Support desk/remove user email

I understand that there is a feature of mediawiki that allows users to use the wiki to email each other. I wish to remove this ability on my mediawiki for any users. Idearly I'd like to be able to do this by administering the wiki as opposed to be editing files. How do I do so?

MediaWiki	1.15.1 PHP	5.2.17 (cgi) MySQL	5.0.91-community-log