I think I am having the same problem as mentioned here. I followed the same steps of adding https: before the image url, but still no difference. The images just appear as a question mark. Are not clickable either to identify any url.
Any ideas why / what I might be doing wrong? It seems like it would be on the postmark side, since as you mentioned the link to the image can be taken from the logs and works in a browser.
It seems to occur with any type of image. jpg, png, etc. Some of them may have been svg as I allowed users to upload. But I am checking and ones that are other types still do not work.
Not sure if this is what you meant, but I did play around with things enough and discovered what I think was part of the issue. In the template, I had forgot to add the {{ }} around the value that postmark uses to identify a passed value. So I was sending the right information, but Postmark didn’t take it due to there not being a place for it to be “plugged in”
I still am having an issue with the header logo in all my emails not displaying. That one is not passed through and is simply a base64encoded image. It shows on the postmark end when I preview an email sent, but does not display in any of the actual emails.
Regardless, it seems as though the initial issue that I raised is fixed.