Username as email on registration.
 

I am trying to modify vbulletin so that a user will not have to enter their email address upo registration.

How this works is all of the users who will be registering to the forums are going to be on the same domain name where the emails are being sent to.

So I want to eliminate the need to enter and email address and instead only require them to enter a suername. Though the system will shoot off an email conformation to them

So if their email address is:
foo@bar.com

Then they'd only have to enter:
foo
as their username and they will recive the email to foo@bar.com

Has anyone done this yet?