On a touch-enabled device, you can draw with your finger, a digital pen, or a mouse.
Available inking features depend on the type of device you're using.
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First, tap the body of the email message.
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Tap Draw > Drawing Canvas to insert a drawing canvas in the message.
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On the Draw tab, tap a pen once to select it.
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Tap again to open the menu of Thickness, Color, and Effect options and select your preferences.