Outlook Signatures - how to stop the image caching

By thedesignfactory ·
I am trying to create a basic application to rotate the image which appears on my signature. The application we have created in PHP is basically selecting an image from a folder on the server and renaming it 'signature.jpg'. The signature.jpg is referenced as an absolute path in the HTML of the signature file.

Problem is that when the signature image changes Outlook doesn't change it - it keeps the old image in cache and renames it to something like image0001.jpg. That image doesn't actually exist on the system, it seems to create it at the time of sending.

The images are changing as when I goto the absolute URL for signature.jpg i can see the image has changed - and therefore the HTML for the signature should pick up this new image.

Desperate to solve this caching issue with Outlook so any help appreciated.

We don't want to manually perform any tasks as this is a solution for a client and has to be totally automated.

We have tested this in Outlook 2003 and 2007 and we get the same result.

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