太邪恶了

[LeoMeiH]

才知道邮件这么不靠谱，连时间都能伪造，搞毛啊。

[pynixwang]

SMTP协议漏洞？

[snullp]

@HowardMei Modern Email service providers will reject or put into spam folder for emails with crazy timestamps. USTC mail just didn't do it at the time of the implementation.

@pynixwang Bug or feature, I can't tell.

@vonfzm No, unfortunately. But I doubt if somebody ever fixed it.

[snullp]

@vonfzm I don't even know if it is still working. If not a pull request is welcomed.
I don't think there is any network restriction as long as you are using a public USTC SMTP server.