Configuring Mail Service Postfix under CentOS 7

http://blog.csdn.net/wh211212/article/details/53040620  (CentOS 7.2 Deployment Mail Server (Postfix))

http://www.linuxidc.com/Linux/2017-03/141392.htm  (using Postfix + Dovecot + Dnsmasq to build a simple LAN mail system under CentOS)