* mh_read_sequences
  * mh_sequences_changed
  * mh_already_notified
  * mh_mkstemp
  * mh_update_sequences
  * mh_sequences_add_one
  * maildir_update_time
  * maildir_delayed_parsing
  * maildir_open_mailbox_append
  * mh_open_mailbox_append
  * maildir_mh_open_message
  * maildir_open_new_message
  * _mh_commit_message
  * mh_rewrite_message
  * mh_sync_mailbox
  * mh_check_mailbox
  * maildir_check_empty
  * mx_is_maildir
  * mx_is_mh()