int mbox_check_mailbox (CONTEXT *, int *);
int mbox_close_mailbox (CONTEXT *);
int mbox_lock_mailbox (CONTEXT *, int, int);
int mbox_check_mailbox (CONTEXT *, int *);
int mbox_close_mailbox (CONTEXT *);
int mbox_lock_mailbox (CONTEXT *, int, int);
int mbox_open_new_message (MESSAGE * msg, CONTEXT * dest, HEADER * hdr);
mx_t* mbox_reg_mx (void);
int mbox_open_new_message (MESSAGE * msg, CONTEXT * dest, HEADER * hdr);
mx_t* mbox_reg_mx (void);