收发室人员使用信件中的收件人信息制作信封，并将信件封在信封中，然后将信封投入信箱以进行投递。
The mail room personnel create an envelope by using the recipient information in your letter, seal your letter in an envelope, and drop the envelope in the mailbox for delivery.
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.
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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