[Dovecot] Stop Maildir appending to path

[Henry]

dovecot -n:
# /etc/dovecot/dovecot.conf
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imaps
ssl_listen: 208.xxx.xxx.xxx
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/imap-login
mail_extra_groups: mail
mail_debug: yes
auth default:
   passdb:
     driver: pam
   passdb:
     driver: sql
     args: /etc/dovecot/dovecot-sql.conf
   userdb:
     driver: passwd
   userdb:
     driver: static
     args: uid=5000 gid=5000 home=/home/vmail/%d/%n allow_all_users=yes
   socket:
     type: listen
     client:
       path: /var/spool/postfix/private/auth
       mode: 432
     master:
       path: /var/run/dovecot/auth-master
       mode: 384
       user: vmail
----------------------

dovecot version: 1.0.rc15

----------------------

Debian Etch (Stable) on AMD64