Fix SG integration tests

Author: medmunds

anymail/tests/test_sendgrid_integration.py

@@ -51,7 +51,7 @@ def test_simple_send(self):
         message_id = anymail_status.recipients['[email protected]'].message_id
 
         self.assertEqual(sent_status, 'queued')  # SendGrid always queues
-        self.assertRegex(message_id, r'\<.+@example\.com/>')  # should use from_email's domain
+        self.assertRegex(message_id, r'\<.+@example\.com\>')  # should use from_email's domain
         self.assertEqual(anymail_status.status, {sent_status})  # set of all recipient statuses
         self.assertEqual(anymail_status.message_id, message_id)