CentOS6.4+LAMP+Postfix+Dovecot+Postfixadmin+Roundcubemail 打造企业级邮件服务器 局域网内部可以正常收发，也可以发送到外网，但收不到外网发过来的邮件
走同样的路，发现不同的人生
Enterprise-level mail serverLANcan send and receive normally within the LAN
Did you forget to configure port mapping on the gateway?
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Did you forget to configure port mapping on the gateway?