[Dovecot] Problem with Thunderbird hang, multiple retry to .Sent/.Draft

[tlum]

I have begun havening a problem when sending or when Thunderbird tries 
to write copy to .Draft. Usually only happens when the message is 
longer. While in the Thunderbird editor will say "Copying message to 
Draft folder". It will try indefinitely. The copy is successful but it 
looks like it is believed to have failed so its retried. Same then 
happens when sending. Send happens but then hangs on copy to .Sent. Copy 
works, but apparently is not seen and just keeps getting retried. If you 
let it go hundreds of copies of message end up in .Sent and .Draft. Have 
logs from Thunderbird and rawlog but they are huge and don't want to 
post them to the list until after determining there is no quick answer 
for this behavior.

dovecot --version = 1.0.rc15

dovecot -n

# /etc/dovecot.conf
base_dir: /var/run/dovecot/
log_timestamp: ¦%Y-%m-%d %H:%M:%S ¦
protocols: imap imaps
listen: 127.0.0.1:143
ssl_listen: *:993
ssl_ca_file: /etc/pki/mydomain/mailserver/certs/class3.crt
ssl_cert_file: /etc/pki/mydomain/mailserver/certs/ms1srvp01.mydomain.net.crt
ssl_key_file: 
/etc/pki/mydomain/mailserver/private/ms1srvp01.mydomain.net.key
disable_plaintext_auth: yes
verbose_ssl: yes
login_dir: /var/run/dovecot//login
login_executable: /usr/libexec/dovecot/imap-login
verbose_proctitle: yes
first_valid_uid: 5000
last_valid_uid: 5000
mail_extra_groups: vmail
mail_location: maildir:/home/vmail/%d/%u:INDEX=/var/indexes/%d/%n
mail_debug: yes
maildir_copy_with_hardlinks: yes
mbox_read_locks: dotlock
mbox_write_locks: dotlock
mail_executable: /usr/libexec/dovecot/rawlog /usr/libexec/dovecot/imap
imap_client_workarounds: outlook-idle, tb-extra-mailbox-sep
auth default:
  user: nobody
  passdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  userdb:
    driver: prefetch
  userdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: vmail
      group: vmail


mail_location: gets an override from userdb SQL lookup. /home/vmail is 
nfs mounted, /var/indexes is is local ext3.

No error messages are logged any place. I think Thunderbird asks for the 
copy and then verifies it. It seems dovecot never confirms they copy 
happened.

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