Merged in [7772] from rjsparks@nostrum.com:

Checks that an email address will survive encoding as part of validating a liaison form. Fixes bug 1410.
 - Legacy-Id: 7812
Note: SVN reference [7772] has been migrated to Git commit a3437c0a21

ietf/liaisons/forms.py

@@ -153,6 +153,10 @@ class LiaisonForm(forms.Form):
                 validate_email(addr)
             except ValidationError:
                 raise forms.ValidationError('Invalid email address: %s' % addr)
+            try:
+                addr.encode('ascii')
+            except UnicodeEncodeError as e:
+                raise forms.ValidationError('Invalid email address: %s (check character %d)' % (addr,e.start))
 
     def clean_response_contact(self):
         value = self.cleaned_data.get('response_contact', None)