You have the option of automatically hyphenating your text to avoid layout problems:
Of course, you can also turn off this feature.
To access this feature, try the following:
Choose "File" > "Design Options..." from the top menu bar.
Then, check or uncheck the box next to "Force hyphenation."
Click "Ok" when you are done.
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