[Dovecot] 1.1.Beta9 deliver problem: Unknown mail storage driver raw

[Velko Ivanov]

Hello,

I'm new to dovecot, trying to configure a Postfix/Dovecot system.
Got everything in place - smtp with dovecot SASL and imap working fine, 
maildir is created, thunderbird logs in successfuly .. but the Dovecot 
LDA gives me this error on delivery: "Couldn't create internal raw 
storage: Unknown mail storage driver raw".
I tried searching the configuration manual, reference, google and this 
list's archives, but found no clue. Checked the source, but it will take 
me some time to figure out what is a storage driver and where is the 
"raw" one hiding, so if somebody could help, please ..

I did it with userdb static initially - uid=dovecot_mail, 
gid=dovecot_mail, home=/usr/local/storage/mail/%d/%n
but after reading, that some passdbs don't work with deliver&static, I 
moved everything to the db (found out that prefetch isn't working with 
deliver btw - moans about userdb_ entries not present, while the imap 
finds them and works happily). It didn't help.

# 1.1.beta9: /usr/local/etc/dovecot.conf
base_dir: /var/run/dovecot
listen: mail.srv.ivanov-nest.com
ssl_cert_file: /usr/local/etc/dovecot.crt
ssl_key_file: /usr/local/etc/dovecot.key
login_dir: /var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
mail_location: dbox:~/Maildir
dotlock_use_excl: yes
maildir_copy_preserve_filename: yes
namespace:
  type: private
  inbox: yes
  hidden: yes
  list: yes
  subscriptions: yes
auth default:
  mechanisms: plain login
  user: dovecot_db
  passdb:
    driver: sql
    args: /usr/local/etc/dovecot-sql.conf
  userdb:
    driver: sql
    args: /usr/local/etc/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: dovecot_mail
      group: wheel