[rationalist]

I migrated away from Gmail after 15+ years to Fastmail, it wasn't that hard.

Whenever I got an email from a company to my Gmail, I logged into my account with that company and made the change. After about 2 or 3 years, I had 99.99% switched over.

Fastmail has a fast bulk import tool, and also allows you to automatically import future emails as the arrive (which is how I got that remaining 0.01% that only emailed me once every 5 years).

I gave each company a (unique identifier)@mydomain so that I could catch when my email address was sold, shared, hacked, etc, which has happened. That also allows me to easily move away from Fastmail to another service provider that has a catchall ability anytime I need to, but hopefully will never need to.