Designing For Desktop & Mobile
With more than 50% of people using mobile devices to view email, responsive design has never been more important and is a major factor in determining the success of Email Campaigns.
It's also vitally important to run tests that check everything looks good in all popular of the most email apps and mobile devices.
To get started without any coding try using wireframes to build from scratch in the drag & drop Email Designer.
More experienced email coders should take a look at the Library Designs markup guide and the benefits of customising your own designs.
Image Dimensions in the Email Designer
When building an Email Template using the Email Designer it is recommended to use images that are at least 640px wide. This is particularly important for impactful header graphics and images that will be displayed at full width on mobile devices.
Smaller images can still be used if it's not necessary for your users or larger images are not available, however, there will be a visual quality difference on higher dpi screens.
Larger images get automatically resized to suit the appropriate drop zone and image property settings.