Thread:Project:Support desk/Allowing creating two users with the same email address

Hello,

I'm setting up a new MediaWiki site using the following versions: MW: 1.20.3 PHP: 5.3.15 MySQL: 5.5.23-55

I noticed that when I am using MW in a full private mode, and when I, as the only admin, create a new user - the software allows me to create a user that uses the same email address as the one used for an already existing user, which may lead to trouble. Why is that? Why isn't this prohibited by the software?