Hi @ネパリ サンデャ
As I know Do not forward option is for restrict print, copy and forward Right?
Yes. Recipients can't forward the email, print it, or copy from it. For example, in the Outlook client, the Forward button isn't available, the Save As and Print menu options aren't available, and you can't add or change recipients in the To, Cc, or Bcc boxes. However, the recipient can open the email, and it is not excluded that the recipient can print the email by other methods.
For more information about how this option works, see Do Not Forward option for emails.
Hope this helps!
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