Force validation of new email address

accounts/pipeline.py

@@ -35,6 +35,14 @@ def require_email(strategy, details, user=None, is_new=False,
     Forces entering email for backends which don't provide it.
     '''
     if user and user.email:
+
+        # Force validation of new email address
+        if strategy.backend_name == 'email':
+            email = details.get('email')
+
+            if email and user.email != email:
+                return {'is_new': True}
+
         return
 
     elif is_new and not details.get('email'):