How to use a html email signature that is hosted online?

for my email signature I want to use a hosted HTML code that is generated through a PHP script, since I may want to change information of the signature I really want that hosted solution to be sure that not only mails in the future, but also sent mails have the "new" signature.

I have a PHP script behind "http://ift.tt/1FBNQ2Z" (yes, no .php ending) waiting for a call. If i open that domain it will output valid HTML code.

But how can I embed the output in my mails as html signature? Iframes are not an option, since they dont work everywhere. Html img tags dont work since that url doesnt output an image.

Any ideas? :-) - Thanks!

via Chebli Mohamed