user = mysql-postfix-user
　　password = mysql-postfix-pass
　　dbname = postfix
　　table = virtual
　　select_field = destination
　　where_field = email
　　hosts = 127.0.0.1

　　mysql-virtual-maps.cf

　　user = mysql-postfix-user
　　password = mysql-postfix-pass
　　dbname = postfix
　　table = users
　　select_field = maildir
　　where_field = email
　　additional_conditions = and postfix = 'y'
　　hosts = 127.0.0.1

　　mysql-virtual-uid.cf

　　user = mysql-postfix-user
　　password = mysql-postfix-pass
　　dbname = postfix
　　table = users
　　select_field = uid
　　where_field = email
　　additional_conditions = and postfix = 'y'
　　hosts = 127.0.0.1

　　mysql-virtual-gid.cf

　　user = mysql-postfix-user
　　password = mysql-postfix-pass
　　dbname = postfix
　　table = users
　　select_field = gid
　　where_field = email
　　additional_conditions = and postfix = 'y'
　　hosts = 127.0.0.1

　　修改Courier相关设置，/etc/courier/imapd:

　　AUTHMODULES="authdaemon"

　　IMAP_CAPABILITY="IMAP4rev1 CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT
THREAD=REFERENCES SORT AUTH=CRAM-MD5 AUTH=CRAM-SHA1 IDLE"

　　修改/etc/courier/pop3d

　　AUTHMODULES="authdaemon"

　　POP3AUTH="LOGIN CRAM-MD5 CRAM-SHA1"

　　修改/etc/courier/authdaemonrc

　　authmodulelist="authmysql authpam"

　　使用mysql验证和pam验证。

　　修改/etc/courier/authmysqlrc

　　MYSQL_SERVER 127.0.0.1
　　MYSQL_USERNAME mysql-postfix-user
　　MYSQL_PASSWORD mysql-postfix-pass
　　#MYSQL_SOCKET /var/run/mysql/mysql.sock
　　MYSQL_PORT 0
　　MYSQL_OPT 0
　　MYSQL_DATABASE postfix
　　MYSQL_USER_TABLE users

　　MYSQL_LOGIN_FIELD email
　　MYSQL_CLEAR_PWFIELD clear
　　MYSQL_UID_FIELD uid
　　MYSQL_GID_FIELD gid
　　MYSQL_HOME_FIELD homedir
　　MYSQL_MAILDIR_FIELD maildir

　　SASL library

　　创建/etc/postfix/sasl/smtpd.conf：

　　pwcheck_method: PAM

　　PAM-MySQL

　　创建/etc/pam.d/smtp：

　　auth optional pam_mysql.so host=localhost db=postfix user=
mysql-postfix-user passwd=mysql-postfix-pass table=users
usercolumn=email passwdcolumn=clear crypt=n
　　account required pam_mysql.so host=localhost db=postfix user=mysql-postfix-user passwd=mysql-postfix-pass usercolumn=email passwdcolumn=clear crypt=n