I am currently in the "process" of migrating, and like you I have a zillion accounts, some of which I've forgotten. I've stolen this from somewhere here on HN I

I am currently in the "process" of migrating, and like you I have a zillion accounts, some of which I've forgotten. I've stolen this from somewhere here on HN I think: - I did _not_ setup mail forwarding. First because I don't want Google to know I'm leaving, and I don't want them to know what my new address is. - like all big changea, the switch to a new, custom domain name is a good moment to make some cleaning. By not forwarding mail I'm curating my existing life to only the things I actually care about. If I haven't received a mail from a specific site in years, maybe that site isn't that important after all - most emails I receive are from some account on some website, so I know I have to migrate this account - but I still might receive important mail from people who still use this old adress. I just copy/paste the content from a client connected to the new adress and reply The issue is that this kind of transition might last for a long time. I haven't decided yet how long I'm going to do it though.