How to draw or scribble on Outlook emails?
Outlook for Microsoft 365 allows you to draw and write with ink when you create or reply to an email message. Before you do it, please click New Email or Reply to see if there is a Draw tab in the ribbon. If not, please follow the first instruction listed in this article to add it to your Outlook ribbon. If you already have the Draw tab, please jump to the following instructions.
Note: For users of Outlook versions other than Microsoft 365, the Draw tab may not be available. However, you could try to highlight selected text within the body of an email message.
Add Draw tab to Message ribbon in Outlook
1. Click New Email to open a Message window.
2. In the pop-up Message window, click File > Option to open Outlook Options.
3. Switch to Customize Ribbon tab, in the Main Tabs group on the right side of the window, tick the box next to Draw.
4. Click OK. Now you are good to draw on a canvas or over a picture.
Draw or scribble on a canvas in Outlook messages
1. Click New Email to create a new email, or click on a message and click Reply to reply to the message.
2. Click on the Draw tab, tap the message body, and then insert a drawing canvas by clicking the 
icon.
3. Now you can pick a pen to draw with (note that the first is an eraser). Also, you can tap the pen you picked again to open the options menu to select your preferred thickness and color for the pen.
4. You can use the selector (the point icon) in the upper left corner to quickly select anything you want to delete or copy in the canvas. And of course you can type any message in the message body where is not covered by the canvas. 
Draw or scribble over a picture in Outlook messages
1. Click New Email to create a new email, or click on a message and click Reply to reply to the message.
2. On the Insert tab, click Pictures to insert a picture.
3. Click the Draw tab, and then pick a pen to draw with (note that the first is an eraser). Also, you can tap the pen you picked again to open the options menu to select your preferred thickness and color for the pen.
4. You can use the selector (the point icon) in the upper left corner to quickly select anything you want to delete or copy in the canvas. And of course you can type any message in the message body.
Related articles
Highlight Selected Text In Message Body In Outlook
When composing, replying, or forwarding an email in Outlook, you may need to highlight some text with color. Here, this tutorial will guide you to highlight the selected text in the message body easily.
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