Select the original sender of the message as an attendee, and click send.

謮选择原本的送信者作为出席者之一，然后按下传送。

youdao

The rogue agent then impersonates the original sender and signs intercepted messages.

于是，伪代理(rogue agent)模仿原发送方并签署被拦截的消息。

youdao

Because signatures are checked (for security purposes), mail must be recalled from the mail file from which it was sent, by the original sender.

由于将检查签名(出于安全性考虑)，因此原发件人必须从发送邮件的邮件文件收回它。

youdao

It did not mention the original sender.

CNN: E-mails show Syrian regime's efforts to handle the media