修改webmail使得该网站可以连接数据库：
#vim /usr/local/apache2/htdocs/extmail/webmail.cf
以下内容行号：2，5，8，112，124，125，126，127，128
SYS_CONFIG = /usr/local/apache2/htdocs/extmail/
SYS_LANGDIR = /usr/local/apache2/htdocs/extmail/lang
SYS_TEMPLDIR = /usr/local/apache2/htdocs/extmail/html
SYS_MAILDIR_BASE = /mailbox
SYS_MYSQL_USER = extmail
SYS_MYSQL_PASS = extmail
SYS_MYSQL_DB = extmail
SYS_MYSQL_HOST = localhost
SYS_MYSQL_SOCKET = /tmp/mysql.sock
#vim /usr/local/apache2/conf/httpd.conf
NameVirtualHost *:80
<VirtualHost *:80>
DocumentRoot "/usr/local/apache2/htdocs/extmail/html/"
ServerName mail.example.com
ScriptAlias /extmail/cgi/ /usr/local/apache2/htdocs/extmail/cgi/
Alias /extmail /usr/local/apache2/htdocs/extmail/html/
ScriptAlias /extman/cgi /usr/local/apache2/htdocs/extman/cgi
Alias /extman /usr/local/apache2/htdocs/extman/html/
</VirtualHost>
！！注意：SuexecUserGroup postfix postfix 该行不可输入，否则报错！
该文件的66，67行，需要修改为
User postfix
Group postfix
完成！！！在Windows XP上使用IE浏览器访问，Linux服务器网页即可
默认邮件账户: postmaster@extmail.org, 密码:extmail