tail -f /var/log/mail.log
Dec 10 19:59:26 ubuntu authdaemond: authmysql: MYSQL_SERVER nor MYSQL_SOCKET set in/etc/courier/authmysqlrc.
Dec 10 19:59:26 ubuntu imapd: LOGIN FAILED, user=sales@xxx.ru, ip=[::ffff:127.0.0.1]
Dec 10 19:59:26 ubuntu imapd: authentication error: Input/output error


etc/courier/authdaemonrc
__________________________
authmodulelist="authmysql"
authmodulelistorig="authuserdb authpam authpgsql authldap authmysql authcustom authpipe"
daemons=5
authdaemonvar=/var/run/courier/authdaemon
DEBUG_LOGIN=0
DEFAULTOPTIONS=""
LOGGEROPTS=""


etc/courier/authmysqlrc
___________________________
MYSQL_SERVER localhost
MYSQL_USERNAME mail_admin
MYSQL_PASSWORD xxxx
MYSQL_PORT 3306
MYSQL_DATABASE mail
MYSQL_USER_TABLE users
MYSQL_CRYPT_PWFIELD password
#MYSQL_CLEAR_PWFIELD password
MYSQL_UID_FIELD 5000
MYSQL_GID_FIELD 5000
MYSQL_LOGIN_FIELD email
MYSQL_HOME_FIELD "/home/vmail"
MYSQL_MAILDIR_FIELD CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/')
#MYSQL_NAME_FIELD
MYSQL_QUOTA_FIELD quota


root@ubuntu:~# telnet localhost pop3
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
+OK Hello there.
user sales@xxx.ru
+OK Password required.
pass xxxxx
-ERR Temporary problem, please try again later
Connection closed by foreign host.