[Mediawiki-l] Email approval before login

[Mischa Peters]

> You can instruct MediaWiki to require verification of email addresses
> entered in user preferences. With a little hacking, you could modify
> the login functions in User.php to check the user's validation hash,
> and see if they've been validated. If not, then you would reject
> login.

One more question in regards to this.
How can you enforce people to fill in their email address?
I haven't been able to find anything on that yet.

Mischa