PHP display a generated image in mail

[Jerrree]

So when users sign up, they get an email, and I'm trying to add an image to that email. That image is dynamically generated using php, so its not a static url. The code works, but when I add it to the email code, the image shows up blank. I know the code works because I have echo'd the body, and the image showed up fine in my browser but empty in the email (i have a border around the image, the border shows up, inside is empty). \[code\]$img = "<img src='http://stackoverflow.com/questions/inc/barcode.php?id=".$regid."' style='padding:5px; border:2px dashed '/>"; \[/code\]elsewhere\[code\]$body .= $img;\[/code\]So does anyone know why the image won't display, and how I could make it so it does?Also, another question to kind of go off this, how do I display a generic url for the image so that instead of /img.php?id="" it just reads /img.php or something.