Email problem in registration

[nnjj.net]

Hello,

I want my users to registration from certain email eg. only from my site nnjj2nnjj.net
so only the users who have nnjj.net email account can register

How I can do this, because when I tried to do it said invalid email!

[Marco van Herwaarden]

There is a hack somewhere, that will turn the Banned Address list into a "Only allowed from" list.

Try doing a search.

[nnjj.net]

I tried to search, it came with a lot of result I was totaly lost!

can any body guid me in this?