这一过程能使您确定消息的发送者以及消息在传递途中是否被修改过。
This process enables you to determine both who sent the message and whether it changed en route.
换句话来说，从某个第三方的角度来说，您无法确定该消息究竟是由发送方创建的还是由接收方创建的。
In other words, from the perspective of some third party, you cannot determine whether the messages were created by the sender or the recipient.
然而，使用电子邮件地址来标识某人的原理并没有缺陷：通常，如果您向一个地址发送一条电子邮件消息，那么您希望它能到达某个确定的人。
Yet the principle of using an E-mail address to identify a person isn't flawed: in general, if you send an E-mail message to an address you expect it to reach a certain person.
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