NULL, /* how do we tell a message is old? */
NULL, /* no way to fetch headers */
NULL, /* no way to fetch body */
NULL, /* no message trailer */
NULL, /* how to delete a message */
NULL, /* how do we tell a message is old? */
NULL, /* no way to fetch headers */
NULL, /* no way to fetch body */
NULL, /* no message trailer */
NULL, /* how to delete a message */