云实例可以连接到您网络内部的机器；这允许那些实例使用您的公司服务，比如邮件路由器和用户目录。
Cloud instances can connect to machines inside your network; this allows those instances to use your corporate services such as mail routers or user directories.
一种更高级的配置包括一些设置，只要邮件数据库超过它的限额时这些设置就会限制路由器发送和接收新消息的能力。
A more advanced configuration involves Settings that limit the router's ability to send or receive new messages for as long as the mail database exceeds its quota.
该响应由路由器生成，作为输入消息的邮件传递的一部分。
The response is generated by a router as part of the mail delivery of the incoming message.
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