def validate_email(self):
feature = RegisterUserFeature()
if not self.data.get('email'):
self.set_error('email', 'Required')
elif not feature.email_valid(self.data.get('email')):
self.set_error('email', 'Invalid email address')
elif feature.email_taken(self.data.get('email')):
self.set_error('email', 'Email already taken')
