Adding your image to a mask
Choose your mask. You can find the options on the right side of the screen:
When you add a mask to your template, you can then simply drag your own photo onto it in order to apply it for your mask.
Double-click the image placeholder you just added. You'll see the image zoom slider which allows you to zoom in to your image:
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A Quick Tour of Mail Designer 365
Advanced Design Techniques
Background
Blend Modes
Campaigns
Configuring Text Styles
Creative Tools
Editing Text
Graphics and Other Objects
HTML Export
Image Areas
Images
Layout Blocks
Links and Buttons
Optimizing your Template for Mobile
Other Sharing Options
Plain Text
Preparing your Design for Sending
Preview your Design
Tables
TextScout
Using Retina Images with your Design