# yum -y install dovecot dovecot-mysql
# chkconfig dovecot on
# vi /etc/dovecot/conf.d/10-mail.conf
mail_location = maildir:/home/email/%d/%n
# cp /etc/dovecot/conf.d/auth-sql.conf.ext /etc/dovecot/conf.d/auth-sql.conf
# cp /usr/share/doc/dovecot-2.0/example-config/dovecot-sql.conf.ext /etc/dovecot/
# vi /etc/dovecot/dovecot-sql.conf.ext
driver = mysql
default_pass_scheme = PLAIN
connect = host=localhost dbname=postfix user=email password=westos
password_query = \
  SELECT username, domain, password \
  FROM email WHERE username = '%u'
user_query = \
  SELECT mailbox, 600 AS uid, 600 AS gid \
  FROM email WHERE username = '%u'
# yum -y install telnet
# telnet localhost 110
Connected to localhost.
Escape character is '^]'.
+OK Dovecot ready. <19ca.1.4e74109f.ZuSZIv+SD1sYR9SPtvSUAg==@desktop24.example.com>
user william@gmail.com
+OK
pass westos
+OK Logged in.
list
+OK 2 messages:
1 548
2 548
.