How can I implement a Custom Registration Scheme with registration email adresses tied to a specific domain?

Ok, I found a solution. It's not optimal, but it's a start.

I modified the UserEmailField class in forum/forms/general.py like so:

class UserEmailField(forms.EmailField):
    def __init__(self,skip_clean=False,**kw):
        self.skip_clean = skip_clean
        super(UserEmailField,self).__init__(widget=forms.TextInput(attrs=dict(login_form_widget_attrs,
            maxlength=200)), label=mark_safe(_('your email address')),
            error_messages={'required':_('email address is required'),
                            'invalid':_('please enter a valid email address'),
                            'domain':_('please enter a valid @domain email address'),## add in new error case
                            'taken':_('this email is already used by someone else, please choose another'),
                            },
            **kw
            )
    def clean(self,email):
        """ validate if email exist in database
        from legacy register
        return: raise error if it exist """
        email = super(UserEmailField,self).clean(email.strip())
        ## My code begins
        if email.endswith('@domain.edu'): #checks if email matches the specified domain
            return email
         else:
            raise forms.ValidationError(self.error_messages['domain'])
        ## My code ends

The remaining email verification works the way it normally does in OSQA. I think ideally you would want this stored in some kind of setting. Perhaps someone who is more familiar with Django and the OSQA source could shed some light on this.