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经常有这种需求，一台Linux服务器配置电信IP和网通IP，默认情况下，后启动的网卡的网关生效。南电信北网通，配置电信和网通IP，无非是为了减少网络延时，使电信用户的请求响应在电信网络中传输，网通用户的请求响应在网通网络中传输。?123修改/etc/iproute2/rt_tables252tel #电信路由表251cnc #网通路由表添加原路返回路由规则，注意：此处原路是广义上的说法
From time to time the mail queue may get filled up. This may be due to network problems or misconfiguration. For instance, if you botch (typo) the relayhost parameter, the mail will be undeliverable.
Jan 2 18:38:00 centos-vb3 postfix/smtp[31492]: warning: SASL authentication failure: No worthy mechs foundJan 2 18:38:00 centos-vb3 postfix/smtp[31492]: F1CFA60BBD: SASL authentication fai
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