[Plugin: Cimy User Extra Fields] Email generated from username

Good afternoon,

I would like to make some changes on the registration process for my blog. I’d like the email field to be generated by using a default domain.
So if user1 creates a new account in my wordpress install, he’d have to options.

1.- Filling the email field with his own email.
2.- If the email field is empty, when submitting autogenerate a email user1@example.com (using my domain)

I am aware that I’ll have to allow custom passwords on registration, but that’s on another stage.

Thanks in advance

http://wordpress.org/extend/plugins/cimy-user-extra-fields/