Not all users have/need e-mail addresses

I'd like to start by thanking you guys for this module. It rocks.

My business has a slight problem, however. It really is very slight, and I imagine I'm just doing something wrong somewhere.

Anyway, not all users have an e-mail account on our Exchange server. When they log in the first time into our intranet site, their account is created just like every other account. However, when I go to edit these accounts in Drupal (to assign roles and such), the e-mail field has just a username (mine) and a password in only the password field (not the confirm password field).

Now, if I had to guess, it is getting the e-mail address and password from the account used to access Active Directory to authenticate user accounts. The name matches (without the @mydomain.com) and the password length is the same.

Is there an easy way to bypass this for users that don't actually have e-mail accounts? I can manually go in and set dummy e-mail addresses in and it appears to work fine, but I don't think that's an ideal solution to this.