dovecot - Dec 2006 - Thunderbird and Quota

Ok, I found my problem,

I run a backend IMAP/POP3 Server (DoveCot) with a front end IMAP/POP3
Proxy Server (DoveCot). I found that the proxy server was not
advertising the fact that it supported QUOTA's. Once I enabled
mail_plugins with quota support for the 2 protocols it all worked.

Is this correct for a proxy server config. I have included my config
below for comments?

##################################
base_dir = /var/run/dovecot/
protocols = imap pop3
disable_plaintext_auth = no
shutdown_clients = yes
syslog_facility = mail
ssl_disable = yes

login_process_per_connection = no
login_processes_count = 5
login_max_processes_count = 128
login_max_connections = 256
login_greeting = POP3/IMAP Server Ready.

protocol imap {
mail_plugins = quota imap_quota
}

protocol pop3 {
mail_plugins = quota
}

auth_cache_size = 16384
auth_cache_ttl = 1800
auth_verbose = no
auth_debug = no
auth_debug_passwords = no
verbose_proctitle = yes

auth default {
  mechanisms = plain

passdb sql {
args = /etc/dovecot/sql.conf
}

userdb static {
args = static uid=1000 gid=1000 home=/dev/null
}

user = root
count = 1
}

plugin {
quota = maildir
}