Using mail to run automator action...

Forgive me if I sound like a rambling idiot here...

Okay, a little back story; I have an automator workflow that I'm working on that I can use to export a project in aperture and build a client webpage from. It's (supposed) to be designed so that I can export this page prebuilt, the client view the images and then select which ones they want. Then, I am (hoping to) have the file names emailed to me, where as Mail will intercept the message and run a workflow that searches the aperture library for the image and attaches a keyword to that image.

Since my image library has unique file names finding the right image won't be a problem. What is a problem is figuring out first of all how to grab the contents of the mail message and pass them into a variable to then search for said variable in my aperture library...

Anyone have any suggestions? Or am I looking in the wrong place (i.e., not possible with this set up)