I have always wondered what amazon was thinking with that way of sorting.
Perhaps it's a deliberate way to spread purchases out over a span of products instead of just the two top products?
I also switched to fastmail from gmail.
I setup gmail to forward all emails to my new address, and then running the gmail importer in fastmail.
So i have all my emails in fastmail, and receive all emails sent to the old address.
I'm using a custom domain for my emails.