Environment
Issue/Symptoms
Check the HTML source code of the email delivery and verify the image URLs to see where the images are hosted and if the URL corresponds with the public resource URL of the instance.
Proofs for transactional messages are sent directly from the marketing instance; they don’t go through the Message Center, so the fact that Proof is ok is irrelevant.
If image URLs don’t match, update them correctly in the transactional message template and republish the template to the Message Center.
Cause
When a template is developed in stage and imported to the production environment without changing the URLs, and the URLs do not match the published URL, the images don’t show correctly in the email.