因此，当用户离线阅读邮件时，发送到服务器的收回请求将告知消息未被读取。
Thus, a recall request sent to the server may report that a message was unread when, in fact, the user read it offline.
它接收这些通知并通过它的电子邮件服务器发送它们。
It receives the notifications and sends them through its email server.
在第一个服务器上的用户向第二个服务器发送电子邮件，反之亦然，因此两个服务器彼此传输消息。
Users on the first server sent mail to users on the second server, and vice versa, so both servers transferred messages to the other.
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