FAIL_CONN
smtp_client_abort(proto, FAIL_CONN, io_error(proto->io));
smtp_client_abort(proto, FAIL_CONN,
smtp_client_abort(proto, FAIL_CONN, "Connection timeout");
smtp_client_abort(proto, FAIL_CONN, io_error(io));
smtp_client_abort(proto, FAIL_CONN, io_error(io));
case FAIL_CONN: