How to include "from address" in email body using auto-forward

The subject pretty much says it all. How can I get an auto-forwarded email to display the email of the sender in the body of the forwarded email? This can be in the format of either the “Forwarded Message” header that shows up when you manually forward a message, or just a single line displaying the email of the original sender.

(A bit of background: In order for the script I am using to work properly, the sender’s email must be in the body, not just the header. We are trying to automatically log emails in our customer database).