输入适当的电子邮件信息，如主题、收件人、发件人等。
Enter the appropriate E-mail information, such as Subject, To, From, and so on.
你的收件夹是你来往信息的稳固渠道。
它允许收件人接收并查看信息，但是会阻止邮件的转发，打印或是复制。
It lets the recipient receive and view the E-mail, but it prevents the message from being forwarded, printed, or copied.
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