Hi,

a few days ago I started to get some complaints about authentication delays from Thunderbird POP3 users. After some debugging it turned out that the problem was introduced somewhere between 1.2rc3 and 1.2rc7 (1.2.0 is still affected).

A session with Thunderbird 2.0.0.22 against 1.2rc3 looks like this:

<<< +OK Dovecot ready.

...

...

CAPA <<< +OK <<< CAPA <<< TOP <<< UIDL <<< RESP-CODES <<< PIPELINING <<< STLS <<< USER <<< SASL PLAIN LOGIN <<< . AUTH PLAIN <<< + <base64> <<< +OK Logged in.

and with 1.2.0 (same client, same config, just replaced the server binaries)

<<< +OK Dovecot ready.

...

...

CAPA <<< +OK <<< CAPA <<< TOP <<< UIDL <<< RESP-CODES <<< PIPELINING <<< STLS <<< USER <<< SASL PLAIN LOGIN <<< . AUTH PLAIN [ 2 seconds delay ] <<< -ERR Authentication failed. AUTH LOGIN [ 5 seconds delay ] <<< + <base64> <base64> <<< + <base64> <base64> <<< +OK Logged in.

In the log I see

mail dovecot: auth(default): plain(?,77.2.39.xx): invalid input

Does anyone have an idea?

# dovecot -n # 1.2.0: /etc/dovecot/dovecot.conf # OS: Linux 2.6.28.2 x86_64 Debian squeeze/sid ext4 protocols: imap imaps pop3 pop3s managesieve listen: *, [::] ssl_cert_file: /etc/ssl/private/pop3.mucip.net.crt ssl_key_file: /etc/ssl/private/pop3.mucip.net.key disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable(default): /usr/lib/dovecot/dovecot/imap-login login_executable(imap): /usr/lib/dovecot/dovecot/imap-login login_executable(pop3): /usr/lib/dovecot/dovecot/pop3-login login_executable(managesieve): /usr/lib/dovecot/dovecot/managesieve-login login_process_per_connection: no verbose_proctitle: yes mail_uid: 5000 mail_gid: 5000 mail_location: maildir:/var/mail/vmail/%1u/%u:INDEX=/var/cache/dovecot/%1u/%u maildir_stat_dirs: yes mail_executable(default): /usr/lib/dovecot/dovecot/imap mail_executable(imap): /usr/lib/dovecot/dovecot/imap mail_executable(pop3): /usr/lib/dovecot/dovecot/pop3 mail_executable(managesieve): /usr/lib/dovecot/dovecot/managesieve mail_plugins(default): quota imap_quota fts fts_squat mail_plugins(imap): quota imap_quota fts fts_squat mail_plugins(pop3): mail_plugins(managesieve): mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 mail_plugin_dir(managesieve): /usr/lib/dovecot/managesieve imap_idle_notify_interval(default): 900 imap_idle_notify_interval(imap): 900 imap_idle_notify_interval(pop3): 120 imap_idle_notify_interval(managesieve): 120 auth default: mechanisms: plain login verbose: yes passdb: driver: ldap args: /etc/dovecot/dovecot-ldap.conf userdb: driver: ldap args: /etc/dovecot/dovecot-ldap.conf socket: type: listen client: path: /var/spool/postfix-mailout/private/auth mode: 432 user: postfix group: postfix master: path: /var/run/dovecot/auth-master mode: 384 user: vmail plugin: quota: maildir quota_rule: *:storage=500M

Thanks, Bernhard