I would like to receive an email, remove the sender’s information, and forward it to a different contact in GMail and/or Hotmail.
Or you can just copy and paste the information you wish to forward.
Yeah e-mail can be edited after pressing forward button and you can remove the sender's info from the body of the mail at that time.
When you forward an email, the sender information shows up in the header of the forwarded message, but that is an editable area. You can simply highlight and remove or replace the Sender information just like you would edit a text document.
It's fairly simple to do this, unless I've misunderstood your question? If this doesn't apply to what you're trying to do, can you elaborate?