http://download.ithome.com.tw/article/index/id/7791
http://download.ithome.com.tw/article/index/id/7792
http://blog.miniasp.com/post/2010/06/15/Postfix-Address-Verification-and-SpamAssassin-Blacklist.aspx
http://download.ithome.com.tw/article/index/id/2362
