[Dovecot] Dovecot and Outlook Express "plaintext authentication not allowed..."

[Birta Levente]

On 17/04/2012 12:16, D Chen wrote:
> Server: Ubuntu 11.10 server with postfix (MTA), dovecot (MDA)
> Mail client: Outlook Express in Windows XP with IMAP on port 143, SMTP on port 25
>
> When tried to set up a new Outlook Express mail acct, the following error encountered:
>
>       Your IMAP server wishes to alert you to the following:
>       plaintext authentication not allowed without SSL/TLS, but your client did it anyway.  If
>       anyone was listening, the password was exposed.
>
> When asked "would you like to download folders from the mail server you added?" then got the
> following error:
>
> The server has rejected your login.  Please verify that your user name and password are correct.
>
> I re-entered several time with the correct username and password, but still responded the same error.
>
> Any insights would be greatly appreciated.
>
>
> Here is the message from the /var/log/mail.log:
>
>
> Apr 17 01:54:17 server dovecot: imap-login: Disconnected (tried to use disabled plaintext auth): rip=
> 192.168.20.51, lip=192.168.20.100Apr 17 01:54:28 server dovecot: imap-login: Disconnected (tried to use disabled plaintext auth): rip=
> 192.168.20.51, lip=192.168.20.100
>
> What might be wrong in my dovecot.conf file.  Below is my dovecot.conf file:
>
> # 2.0.13: /etc/dovecot/dovecot.conf
> # OS: Linux 3.0.0-16-server x86_64 Ubuntu 11.10
> log_timestamp = "%Y-%m-%d %H:%M:%S "
> mail_location = maildir:~/Maildir
> mail_privileged_group = mail
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date
> passdb {
>    driver = pam
> }
> passdb {
>    driver = pam
> }
> plugin {
>    sieve = ~/.dovecot.sieve
>    sieve_dir = ~/sieve
> }
> protocols = imap pop3 sieve
> service auth {
>    unix_listener /var/spool/postfix/private/auth-client {
>      group = postfix
>      mode = 0660
>      user = postfix
>    }
>    unix_listener /var/spool/postfix/private/dovecot-auth {
>      group = postfix
>      mode = 0660
>      user = postfix
>    }
>    user = root
> }
> ssl_cert =</etc/ssl/certs/dovecot.pem
> ssl_cipher_list = ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MEDIUM
> ssl_key =</etc/ssl/private/dovecot.pem
> userdb {
>    driver = passwd
> }
> userdb {
>    driver = passwd
> }
> protocol imap {
>    imap_client_workarounds = delay-newmail
>    mail_max_userip_connections = 10
> }
> protocol pop3 {
>    mail_max_userip_connections = 10
>    pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
>    pop3_uidl_format = %08Xu%08Xv
> }
> protocol lda {
>    deliver_log_format = msgid=%m: %$
>    mail_plugins = sieve
>    postmaster_address = postmaster
>    quota_full_tempfail = yes
>    rejection_reason = Your message to<%t>  was automatically rejected:%n%r
> }
>
Maybe
auth_mechanisms = plain login cram-md5