-int mh_check_empty (const char *);
-int mh_commit_message (CONTEXT *, MESSAGE *, HEADER *);
-int mh_open_new_message (MESSAGE *, CONTEXT *, HEADER *);
-
-int maildir_read_dir (CONTEXT *);
-int maildir_check_mailbox (CONTEXT *, int *);
-int maildir_check_empty (const char *);
-int maildir_commit_message (CONTEXT *, MESSAGE *, HEADER *);
-int maildir_open_new_message (MESSAGE *, CONTEXT *, HEADER *);