There's not a great way unfortunately. I just switched all of my accounts that send transactional emails (Amazon receipts, Uber, etc) over to iCloud and then fo

There's not a great way unfortunately. I just switched all of my accounts that send transactional emails (Amazon receipts, Uber, etc) over to iCloud and then forwarded my old Gmail. There's no turn-key method I'm aware of, but It was important to me that I could have my purchase and trip logs stored somewhere that respects my privacy.