Changing E-mail adress from profile?

I have a problem wýth the e-maýl adresses. When a user regýster to your forum, they aplly wýth X maýl adress. After a whýle, they want to change that X maýl adress.

Is there any way to dýsable thýs optýon.? I dont want them to change theýr emaýl adress after the regýstratýon.

Or

When they change theýr emaýl adress, theýr account would be ýnactýve untýl the admýn gýve hým/her a permýssýon to change emaýl adress?

If you answer my questýon, I wýll be apprecýate

[Xenon]

in your acp you can activate the checkmail function, that'll put all new users into user awaiting email validation group.

i think this also happens when they change their address