This message does not include the sender’s digital signature. The absence of a digital signature means that the message could have been sent by someone pretending to have this email address. It is also possible that the message has been altered while in transit over the network.
此消息中没有包含发送者的数字签名。缺少数字签名表明此消息可能是某个伪装拥有此邮件地址的人发送的。也有可能此消息在传送过程中已经被更改。