So this is kind of a strange/specific question having to do with Google's forwarding. I'm trying to automatically forward emails sent to trips@my-app.com to an email parsing service called Worldmate without having the Subject of the forwarded email being changed. Is this a thing that can be done? If so, any idea how? Thanks in advance!
If you auto-forward the mail with a forward setting or filter then the subject and body should not be modified. When you manually forward a message from the Gmail UI, Fwd: is added to the subject and the basic headers are added to the body.