forwarding when somebody already has an account

[Chris Cera]

Say I have a user account for some user, joe.  I want to easily
forward his mail.  Using a .qmail-joe in ~alias only works if
they don't have an account, but joe has an account, and I want
his mail forwarded anyway.  Is there an easy way to do this?
-- 
    _/_/_/  _/_/_/ _/_/_/_    _/_/_    [EMAIL PROTECTED]
   _/      _/      _/   _/   _/  _/                            /"\
  _/      _/_/_/  _/ _/     _/_/_/     ASCII RIBBON CAMPAIGN   \ /
 _/      _/      _/  _/    _/  _/       AGAINST HTML MAIL,      X 
_/_/_/  _/_/_/  _/    _/  _/  _/.ws    AND NEWS TOO, dammit!   / \