10 | test_send.error |         5 | {"error": "('invalid_client: The OAuth client was not found.', {'error': 'invalid_client', 'error_description': 'The OAuth client was not found.'})"}
  9 | test_send.error |         5 | {"error": "('invalid_client: The OAuth client was not found.', {'error': 'invalid_client', 'error_description': 'The OAuth client was not found.'})"}

--- empty body guard ---
{"detail":"Provide a template or message body"}
--- no-account guard (bad id) ---
{"detail":"Gmail account not found"}