环境是：exchange2013邮箱+边缘服务器，发现发往国外邮箱服务器经常被延迟，报错如下：
Remote Server atemail2.bureauveritas.com (83.145.101.190) returned '400 4.4.7 Message delayed'
2018/7/16 4:33:22 - Remote Server at email2.bureauveritas.com (83.145.101.190)returned '441 4.4.1 Error encountered while communicating with primary targetIP address: "421 4.4.2 Connection dropped due to SocketError."Attempted failover to alternate host, but that did not succeed. Either thereare no alternate hosts, or delivery failed to all alternate hosts. The lastendpoint attempted was 83.145.101.190:25' 在网络上查询了很多，有人是同样的报错，改谷歌DNS解决，我现在边缘只有1块网卡，设置的是防火墙映射内网IP的方式，我现在是否直接增加一块网卡，设置增加网卡的DNS为谷歌的是否就可以了呢？