*** POSSIBLE PITFALL *** POSSIBLE PITFALL *** POSSIBLE PITFALL ***

    The programs are designed to run as the hash user. If you're a
    sysadmin that likes to do things as root, you may come unstuck,
    since running the admin programs as root will mean that files
    and directories are created as root, which will then mean that
    qmail will refuse delivery. If you think you might make this
    mistake, change INSTALL_DIR in the Makefile to something that's
    fairly 'Hidden' (i.e. _not_ on root's PATH), and put this
    location on the PATH for your nominated hash user. That way you
    can't inadvertently run the admin programs as root. I'm sure
    there are clever Unix tricks with whoami, or maybe fun with
    things like sticky bits that might help the scripts avoid making
    any changes if they're run as root, but I'm not sure. Ideas
    anyone?