Permissions Dilemma?

[Tony Campisi]

When I set up my Sendmail box last year I added all of my users in
'userconf' as POP accounts (mail only). Approx 250. As I'm attempting to add
Maildir folders under their /home/name directories, I cannot chown Maildir.
For example:

drwx------   5 root     popusers     1024 Jul 21 11:22 Maildir
[root@mail2 /home/al.koch]# chown -R al.koch /home/al.koch/Maildir
chown: al.koch: invalid user

Will I have to remove all my users and add them as regular users?

thanks,
tony.campisi