XML signatures sent along with content help ensure the identity of the sender.

随内容一起发送的XML签名可以帮助确保发送者的身份。

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Each message is transported in its own crypto envelope, which includes both the payload and the identity of the sender.

每条消息都在自己的加密信封中传输，加密信封包含发送者的负载和身份。

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From the recipient's perspective: When receiving a message, how is the identity of the sender and the content of the message authenticated?

从接收方的角度来看：在接收消息时，发送方的身份和消息的内容是如何得到验证的呢？

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Messages that appear in the priority box will initially be determined by an algorithm based on such as factors as the identity of the sender, key phrases in the message and whether the mail was sent to an individual or a large group.

CNN: Gmail looks to clear clutter with Priority Inbox