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For classic Outlook, in an email message you're composing, select the Options tab, then select the down arrow next to  Encrypt.
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Choose Do Not Forward.
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Finish composing and sending your message.
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For new Outlook​​​​​​​, in an email message you're composing, select the Options tab.
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Select  Encrypt.
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Select Do Not Forward.Â
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Finish composing and sending your message.
