上月底我说到：在GMAIL上做备份，结果删了sent mail里的到trash，然后全选点了delete forever，之后再到inbox里，me to me的备份mail也没了。

Ivy建议我mail给gmail Team，求助。

GMAIL TEAM的回复邮件如下：

Hello,

Thank you for your message.

Gmail uses unique threading technology to display a single message or conversation in a variety of views. You can view your messages by label, conversation, or location, among other choices. Please note that if you delete a message from any view, including 'Sent Mail,' it is permanently removed from your Gmail account, and is no longer accessible through various labels and views.

Sincerely,

The Gmail Team

虽然回信很快，而且礼貌周全，但是丢的东西铁定找不会来了。只能是长了个gmail的“知识”：对于相同的邮件，不同路径下的文件只有一个。