It says nothing about LDAP here, which means that unless you filtered out some lines it's not using LDAP at all for anything. What does your dovecot -n output show now?

dovecot -n

1.2.3: /etc/dovecot.conf

OS: Linux 2.6.18-128.4.1.el5 x86_64 CentOS release 5.3 (Final) ext3

log_path: /var/log/dovecot.log info_log_path: /var/log/dovecot.log protocols: pop3 pop3s imap imaps listen(default): 123.456.789.71 listen(imap): 123.456.789.71 listen(pop3): 123.456.789.72 ssl_listen(default): ssl_listen(imap): ssl_listen(pop3): 123.456.789.72:995 ssl_ca_file: /etc/pki/dovecot/certs/pop_core_uk/trustcenter_intermediate.crt ssl_cert_file: /etc/pki/dovecot/certs/pop_core_uk/server.crt ssl_key_file: /etc/pki/dovecot/private/pop_core_uk/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_location: maildir:/home/vmail/%Lu/Maildir/ mail_debug: yes 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/lib64/dovecot/imap mail_plugin_dir(imap): /usr/lib64/dovecot/imap mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3 imap_client_workarounds(default): delay-newmail outlook-idle netscape-eoh imap_client_workarounds(imap): delay-newmail outlook-idle netscape-eoh imap_client_workarounds(pop3): pop3_client_workarounds(default): pop3_client_workarounds(imap): pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh lda: debug: yes postmaster_address: postmster@core.uk hostname: smtp.core.uk mail_plugins: quota quota_full_tempfail: yes log_path: /var/log/dovecot-deliver.log log_timestamp: %b %d %H:%M:%S rejection_reason: Ihre Nachricht an <%t> wurde automatisiert abgewiesen:%n%r auth default: mechanisms: plain login username_translation: @_._ verbose: yes debug: yes debug_passwords: yes passdb: driver: ldap args: /etc/dovecot-ldap.conf userdb: driver: static args: uid=500 gid=500 home=/home/vmail/%Lu allow_all_users=yes userdb: driver: ldap args: /etc/dovecot-ldap-userdb.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: postfix plugin: quota: maildir:User quota quota_rule: *:storage=8M quota_warning: storage=90%% /usr/local/bin/quota-warning.sh 90 quota_warning2: storage=75%% /usr/local/bin/quota-warning.sh 75

dovecot-ldap.conf

hosts = 123.456.789.123 123.456.789.124 base = OU=one,OU=two,OU=London,OU=GB,OU=User Accounts,DC=three,DC=core,DC=uk ldap_version = 3 auth_bind = yes auth_bind_userdn = %u@three.core.uk

user_filter = (&(objectClass=person)(cn=%u)) user_attrs = description=quota_rule=*:storage=%$M

dovecot-ldap-userdb.conf is a symbolic link on dovecot-ldap.conf

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