pop3d config, This user has no $HOME/Maildir

[Bruce Edge]

I'm getting this message from my pop3 clients.

   Could not login in to mail server.
   The server responded:

   This user has no $HOME/Maildir

Well, the user does have a Maildir. I can see new mail piling up in
Maildir/new.


It's being started as follows:

supervise /var/lock/qmail-pop3d tcpserver -v -c40 -u0 -g0 0 pop-3 qmail-popup
checkpassword qmail-pop3d Maildir 

Any ideas as to what to do next?
If this is a case of RTFM could someone direct me to the appropriate section
in the FM?

Thanks, Bruce.