Can't speak for the OP but I recently changed address. My solution was to forward mail from my old Gmail account to my new account. Any newsletters I got I either unsubscribed or hit the link to update my details with them. Anytime I logged into a website that required my old email I took a minute to update it to my new one. And after I replied to a contact from my new email they naturally just hit the reply button so started replying to my new account. I've changed emails a few times now and I just keep the forwarding going for a year or two. Then I check in and once then only stuff coming into that account is spam for a few months I feel it's safe to delete the account. The one thing you lose out on is old email (what if I want to search emails for 5 years ago for example). AFAIK FastMail has an import system that will import all your email for you. I'm not using FastMail but I found over time I'm just not going back to old emails often enough for it to matter.
