I have a domain registered, but it isn't attached to a hosting package or e-mail account. I will do soon, but not at the moment. Right now, I would like to set up an e-mail forwarding scenario. So, I could have the email email@example.com forward to firstname.lastname@example.org. I know this much is possible.
I would like the Gmail account to keep the forwarded e-mail address when replying. So when I reply to emails sent to Gmail through my e-mail forwarding, I would like any reply to say it came from email@example.com instead of firstname.lastname@example.org.
How would I go about it?