When I migrated emails last time, I setup my old email to automatically forward to the new email. Then on my new email, I setup an automatic label for any email that was addressed to the old address. Every week or two I’d review what was sent to it and either update the email address used or unsubscribe. Eventually it got to a level where I wasn’t getting much at the old email anymore and finally deleted it.
My bonus just came in today. Was planning to order one of these this week. Not sure of I’ll wait to see what’s happening at PAX. All they’ve said so far is that Steam will be there.