It's always good to review your email
Mail Designer 365 is continuously scanning your design for issues that can occur. For example, too many animated graphics or other things in your template can affect the experience
of your design.
As soon as Mail Designer 365 finds an issue you will get a notification in the top right corner of the Mail Designer 365 window. The badge shows you how many issues Mail Designer found.
Open the check window, to see the issues Mail Designer 365 found. You will also get a description about the issues found, so you can make the necessary changes.
In the example the link is incorrect and might not work:
How Can We Help?
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