I run iRedMail (iredmail.org) as my personal email server (it's really postfix+dovecot+etc) and Nextcloud (nextcloud.com) for file, calendar, and contact sharing. You can link the two so they share identities. Taken together, this combo is really solid replacement for the free and surveillance-capitalism-based ecosystem. https://forum.iredmail.org/post69001.html
@paco Running your own email is fine, but you create a very real reliance on whatever server you're running at home there, and patching the Linux Layer routinely etc.
I came across Protonmail and have used them since yahoo sold out.
@sudocat You're right. But there are trade-offs everywhere. When you use a 3rd party provider, they have a say (by means of their Ts & Cs) in what you can email or not email. I've run my own email server since 1999 or so. I'm comfortable with it. The whole ecosystem is a house of cards, though. It's not for the faint of heart.
A Mastodon instance for info/cyber security-minded people.