R: system_aliases for root@localhost
R: system_aliases for harpal@example.com
R: userforward for harpal@example.com
R: procmail for harpal@example.com
R: maildrop for harpal@example.com
R: local_user for harpal@example.com
harpal@example.com
    <-- root@localhost
  router = local_user, transport = maildir_home