We are currently in the testing phase of a new add on for our GreenTools for Google Apps (G4G) product.
This application will allow you to download email from any GMail Account (even GMail for Business) and split the email into:
All of the components of the email will be available for you to work with and process as separate files after the email is downloaded.
You can select to:
There is also an option to mark each email retrieve as "read" so that you won't retrieve it more than once.
Keep an eye out for more information soon, or visit the GreenTools for Google Apps (G4G) website.