I've tried everything I could think of using your code and making stuff up. no luck. I just don't know why it wont pull the images from my server. It works fine when displaying the sales receipt in the orders history in the browser. But the email that I get has a missing thumbnail image.
{include file="product_thumbnail.tpl" productid=$product.productid}<br /> This one works when viewing in the browser when looking up orders history. But you get a missing image with the red x in emails.
I have tried all these:
{include file="http://www.systemskins.com/skin1/product_thumbnail.tpl" productid=$product.productid}
{include file="https://www.systemskins.com/skin1/product_thumbnail.tpl" productid=$product.productid}
<img src="http://www.systemskins.com/image.php?productid={$product.productid}">
<img src="http://www.systemskins.com/image.php?productid=$product.productid">
<img src="{$http_location}/image.php?productid={$product.productid}">
Any other suggestions?