Create a new message.

View New Message Window...

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Click on the Options tab at the top of the window to display the Options ribbon.

View Options Ribbion...

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Click the Lock Button / Encrypt Button to view the Set Encryption menu.

View Lock Button / Encryption Button...

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Choose Encrypt from the Set Permissions menu.

View Set Permissions Menu...

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When encryption is enabled, the top of the message window will display a notice stating that the message is encrypted.

View Encrypted Message Notice...

Attach file(s) and send message as usual.

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