[Dovecot] Maildir/mbox on a per-user basis

Hello,

The Wiki indicates that Dovecot can do either mbox or Maildir on a per-user basis:

default_mail_env can be overridden in userdb for each user. This works with userdbs supporting the "mail" attribute (eg. passwd-file, SQL, LDAP).

How exactly does one do this for passwd-file?

Thanks,

-Jon

-- Jon Nathan jon@rupture.net