When I moved many years ago, I migrated well over 50,000 emails with FastMail’s importer. Other than taking a few hours (all async), there’s nothing to it. Enjoy!
(I’m unaffiliated, just a paying customer. If you care about customer support, privacy, or entrepreneurship, then FastMail - or another paid service - is a better fit than a free service can ever be)
For me it was a couple of hours of work, going though the password manager, logging in and changing the e-mail address in the profile. I haven't migrated all and probably never will - the accounts I don't care about can stay on gmail
Maybe you use email very differently? I find myself occasionally needing years-old emails to find info I've long-since forgotten and it's a lot easier to have all of it in one place.
When I moved many years ago, I migrated well over 50,000 emails with FastMail’s importer. Other than taking a few hours (all async), there’s nothing to it. Enjoy!
(I’m unaffiliated, just a paying customer. If you care about customer support, privacy, or entrepreneurship, then FastMail - or another paid service - is a better fit than a free service can ever be)