基于CentOS6.5以上的邮箱服务器开源软件，安装方便，企业可以有自己的邮箱了（下载完，自己在文件后缀加上.bz2，之后再解压）(Based on CentOS6.5, the open source software of mailbox server is easy to install, and enterprises can have their own mailboxes.)