Postfix+courier-imap:
ubuntu下用postfix搭建邮件服务器
http://blog.csdn.net/bird_wang/article/details/4225113
PostfixBasicSetupHowto
https://help.ubuntu.com/community/PostfixBasicSetupHowto
courier-imap +squirrelMail:
在ubuntu下用squirrelmail架设webmail
http://blog.csdn.net/bird_wang/article/details/4228222
SquerrilMail介绍及安装配置
http://blog.csdn.net/bird_wang/article/details/4228550
相关：
使用mailx发送邮件
http://www.cnblogs.com/softwaretesting/archive/2011/11/23/2260520.html
mailx发送邮件
http://blog.csdn.net/v_love/article/details/7762016
Postfix 学习 -- Linux添加/删除用户和用户组
http://blog.csdn.net/xueye3000/article/details/7547142
以单独的用户和用户组运行Apache
http://www.chinaz.com/web/2011/0728/202173_2.shtml
Ubuntu下安装和配置Apache2
http://www.blogjava.net/duanzhimin528/archive/2010/03/05/314564.html
常见问题：
> "Bad sequence of commands - Server replied: 503 Error: authentication not enabled" This is a mail server/SquirrelMail configuration problem. SquirrelMail needs to be configured NOT to use authentication with connecting with the mail server or the mail server needs to have authentication enabled.