Here are some steps you can take to troubleshoot your email images not displaying properly:
Check that MIME type associated with the image is supported by email providers.
Make sure your image is not too large, as some email programs have a limit on the size of images they can display.
Check if the image has a non-standard filename extension like .PNG. Some email programs do not support images with a non-standard filename extension.
Make sure your HTML code is properly coded. Improper code may result in images displaying in a different way than intended.
Ensure that the images are hosted on an accessible and reliable domain.
