Manual:ResetUserEmail.php/en

Details
resetUserEmail.php file is a maintenance script to change the email address of users on the wiki, and mark the email address as confirmed. In addition to that, it will set a random password on that account. This will require the user to reset their password in order to be able to login again.

This can be used to set or change an email address on an account that doesn't have a confirmed email address or the email address is no longer accessible. This can also be used to effectively lock an account by setting the email address to a fake one, since it also resets the password.

Example
To change a user's, e. g. John Doe, email address to "johndoe@example.com" and reset their password: