PPP链路一般工作于Server Mode以提供远程访问接入服务,当发送电子邮件告警信息时,PPP链路切换至Client Mode。电子邮件告警信息的发送采用SMTP(Send Mail Transfer Protocol)协议,发送前应设置ISP(Internet Service Provider)为到达电子邮局的出口网关,例如ISP可选用163电信局,电子邮局可选用263邮局。
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