int mbox_check_empty (const char *);
int mbox_is_magic (const char*, struct stat*);
int mbox_strict_cmp_headers (const HEADER *, const HEADER *);
-int mbox_open_new_message (MESSAGE * msg, CONTEXT * dest, HEADER * hdr);
mx_t* mbox_reg_mx (void);
mx_t* mmdf_reg_mx (void);