Handle email errors in a better manner

endpoints/common.py

@@ -20,6 +20,7 @@ from functools import wraps
 from config import getFrontendVisibleConfig
 from external_libraries import get_external_javascript, get_external_css
 from endpoints.notificationhelper import spawn_notification
+from util.useremails import CannotSendEmailException
 
 import features
 
@@ -129,6 +130,11 @@ def handle_dme(ex):
   logger.exception(ex)
   return make_response(json.dumps({'message': ex.message}), 400)
 
+@app.errorhandler(CannotSendEmailException)
+def handle_emailexception(ex):
+  logger.exception(ex)
+  message = 'Could not send email. Please contact an administrator and report this problem.'
+  return make_response(json.dumps({'message': message}), 400)
 
 def random_string():
   random = SystemRandom()