Can you share your code? It's not quite clear how to actually create the mail. What exactly do you use to create the mail?
I think you'll also have to pass the complete url of the image otherwise the mail client will not be able to show it. But I'm not completely sure. To test.
I think you'll also have to pass the complete url of the image otherwise the mail client will not be able to show it. But I'm not completely sure. To test.