static void smtp_server_connection_destroy(struct connection *_conn)
{
	struct smtp_server_connection *conn =
		(struct smtp_server_connection *)_conn;

	smtp_server_connection_disconnect(conn, NULL);
	smtp_server_connection_unref(&conn);
}
static void smtp_server_connection_destroy(struct connection *_conn)
{
	struct smtp_server_connection *conn =
		(struct smtp_server_connection *)_conn;

	smtp_server_connection_disconnect(conn, NULL);
	smtp_server_connection_unref(&conn);
}