Ticket #7655: 7655.patch

django/core/mail.py

@@ -205 +205 @@
         conversions.
         """
         if to:
+            assert not isinstance(to, basestring), 'must be a list or tuple'
             self.to = list(to)
         else:
             self.to = []
         if bcc:
+            assert not isinstance(bcc, basestring), 'must be a list or tuple'
             self.bcc = list(bcc)
         else:
             self.bcc = []