Issue
If images added to the email signatures do not work, please make sure you check how these images are added in the template.
Product
Mobile Service Cloud
Resolution
The source of the image should be added, navigate to Settings -> Templates and click on the image symbol.
The following pop-up will be shown, here you can add the image source and the dimensions:
❗ To assure the images being shown in every email client, it is recommended the images are being hosted on the domain used to send the email. ❗