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The difference between ordinary mail and encrypted mail or digitally signed mail.
Clear text transmission refers to the ordinary mail content transmission mode, which is basically the sending and receiving of original data. After receiving it, you can directly see the content without any processing. Encrypted email means that the content you send is encrypted, and then the recipient needs the same encryption method to decrypt it before reading it; Digital signature only means that this email was sent by your computer, which is equivalent to signature, only electronic.