E-mail reject on registration

[ogetbilo]

I am looking for a script that will reject some mail adress on registration.
for example when he enters anything@mynet.com because the registration will prompt that mail adress is not allowed in registration.
Is there a modification for this ?

[Zachery]

You can ban email address :)

[ogetbilo]

What will happen to my registered members who is using that mail adress ?

[Zachery]

What will happen to my registered members who is using that mail adress ?
There is an option right below to allow users to keep banned email address :)