[root@xxx etc]# dovecot --version 1.1.3

[root@adi-ion etc]# dovecot -n # 1.1.3: /usr/local/etc/dovecot.conf log_path: /var/log/dovecot protocols: imap imaps pop3 pop3s ssl_cert_file: /etc/postfix/smtpd.cert ssl_key_file: /etc/postfix/smtpd.key disable_plaintext_auth: no login_dir: /usr/local/var/run/dovecot/login login_executable(default): /usr/local/libexec/dovecot/imap-login login_executable(imap): /usr/local/libexec/dovecot/imap-login login_executable(pop3): /usr/local/libexec/dovecot/pop3-login mail_location: maildir:/home/vmail/%d/%n/ mail_debug: yes mail_executable(default): /usr/local/libexec/dovecot/imap mail_executable(imap): /usr/local/libexec/dovecot/imap mail_executable(pop3): /usr/local/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/local/lib/dovecot/imap mail_plugin_dir(imap): /usr/local/lib/dovecot/imap mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 pop3_uidl_format(default): %08Xu%08Xv pop3_uidl_format(imap): %08Xu%08Xv pop3_uidl_format(pop3): %v.%u auth default: mechanisms: plain login debug: yes debug_passwords: yes passdb: driver: sql args: /usr/local/etc/dovecot-sql.conf userdb: driver: sql args: /usr/local/etc/dovecot-sql.conf socket: type: listen master: path: /usr/local/var/run/dovecot/auth-master mode: 384 user: vmail group: vmail

The log looks like this - it happens every few days:

dovecot: Sep 28 02:28:40 Warning: pop3-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: imap-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: pop3-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: auth(default): Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: pop3-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: imap-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: imap-login: Killed with signal 15 dovecot: Sep 28 02:28:40 Warning: I/O leak: 0x407150 (24) deliver(xxx@xxx.com): Sep 28 04:07:04 Error: Can't connect to auth server at /usr/local/var/run/dovecot/auth-master: No such file or directory deliver(xxx@xxx.com): Sep 28 04:07:53 Error: Can't connect to auth server at /usr/local/var/run/dovecot/auth-master: No such file or directory deliver(xxx@xxx.com): Sep 28 04:08:12 Error: Can't connect to auth server at /usr/local/var/run/dovecot/auth-master: No such file or directory deliver(xxx@xxx.com): Sep 28 04:13:18 Error: Can't connect to auth server at /usr/local/var/run/dovecot/auth-master: No such file or directory deliver(xxx@xxx.com): Sep 28 04:13:18 Error: Can't connect to auth server at /usr/local/var/run/dovecot/auth-master: No such file or directory

It's not a rpm installation, it compiled by me. The OS is a CentOS5.2.