[Dovecot] outlook problem if TLS mailsettings are off

[Georg Käfer]

Dear List,

I dont know if its a dovecot config problem or whatever else issue.
Behaviour:
If I set /etc/dovecot/dovecot.conf:

	Following is valid with IMAP mailboxes only:

disable_plaintext_auth = yes   # outlook 2007 with TLS in/out enabled can show index of mails and klick on mail does preview / doubleklick opens mail PERFECT AS INTENDED
disable_plaintext_auth = no    # outlook 2007 with TLS/SSL OFF can show index of mails, but (double)-/klick on mail gives me "sandwatch"-mouspointer and I've to restart outlook again (and enable TLS again to get it work again)

	with POP3 mailbox both variants are working smoothly.

	Other ssl/tls settings:
	ssl_disable = no
      login_process_per_connection = yes

using or not using following makes no difference...
imap_client_workarounds(default): outlook-idle delay-newmail
imap_client_workarounds(imap): outlook-idle delay-newmail
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh


I'm sad - but I can't force SSL/TLS for my users - so I can't "solve" this by using "disable_plaintext_auth = yes"
Is there any way out of the dark?

my data:

gentoo linux
dovecot 1.1.7
postfix 2.5.5
postfixadmin-2.2.1.1
mysql 5.0.70-r1
php 5.2.8-pl12

dovecot -n
# 1.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.26-gentoo-r3 i686 Gentoo Base System release 1.12.11.1 ext3
protocols: pop3 pop3s imap imaps
ssl_cert_file: /etc/ssl/dovecot/server.pem
ssl_key_file: /etc/ssl/dovecot/server.key
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
mail_max_userip_connections(default): 10
mail_max_userip_connections(imap): 10
mail_max_userip_connections(pop3): 30
first_valid_uid: 8
last_valid_uid: 8
first_valid_gid: 12
last_valid_gid: 12
mail_privileged_group: mail
mail_uid: mail
mail_gid: mail
mail_location: maildir:/var/mail/%d/%n/Maildir/:INDEX=/var/mail/%d/%n/indexes
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/lib/dovecot/imap
mail_plugin_dir(imap): /usr/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/pop3
imap_client_workarounds(default): outlook-idle delay-newmail
imap_client_workarounds(imap): outlook-idle delay-newmail
imap_client_workarounds(pop3): 
pop3_client_workarounds(default): 
pop3_client_workarounds(imap): 
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
  mechanisms: plain login
  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: 384
      user: mail
      group: mail

regards,
Georg Kaefer