搭建邮件服务器：postfix, courier, mysql ubuntu-9.10

非常新的邮件服务器安装介绍，很详细，链接如下：
http://library.linode.com/email/postfix/postfix-courier-mysql-ubuntu-9.10-karmic
下面是自己的补充，本想把这折腾的几天的经验给个评论，可提交失败，这里做个记录。

Hi Guy, Thanks for this detailed tutorials, I read this guide word by word, even this, there are still some problems, which takes me long time to kill them by reading the logs, syslog, mail.info,mail.log, mysql.log(displayed only mysql log is manually enabled), auth.log, and cyrus-sasl source code.

1). Don't forget to delete or mark out the following two lines at file /etc/pam.d/smtp by adding a character "#" . otherwise, pam_unix module will be selected by saslauthd, and cause smtp authentication failure.

#@include common-auth

#@include common-account

2). Don't add your virtual domain to "$mydestination" of the main.cf, All domains listed as $mydestination in your main.cf are treated as local domains. Emails for local domains are delivered to system users. The mails will be delivered to /var/mail. if you add your virtual domain to mydestination, your email client, eg, evolution, won't get emails via imap/pop, for the mailbox at /home/vmail/$domain/$user is still empty.

3). The environments are different, possible you may not encounter the same problems, but the logs and source code are always a good way to solve the problem. Hope my experiences will be helpful to the new vistors. Thanks!

Reference: http://workaround.org/ispmail/sarge