DSN 5.7.1 means the message is not allowed to be delivered--often because it is believed to be spam, or contain a virus, but it could be other things as well.
There's really no way to know why the message was rejected without consulting the logs of the server that issued the rejection.
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DSN 5.7.1 表示不允许传递邮件——通常是因为它是被认为是垃圾邮件或包含病毒，但也可能是其他东西。
如果不查阅发出拒绝的服务器的日志，实际上无法知道消息被拒绝的原因。
DSN 5.7.1 means the message is not allowed to be delivered--often because it is believed to be spam, or contain a virus, but it could be other things as well.
There's really no way to know why the message was rejected without consulting the logs of the server that issued the rejection.