I've been using ProtonMail for my personal domain since 2016, but this week migrated over to Fastmail.
PM's ability to easily encrypt message contents is what initially drew me to the service, but I quickly realized that was only of marginal utility. Email wasn't designed to be secure, and there are better E2EE ways to pass along sensitive information.
So far, I'm loving FM. It's truly fast, easy to set up, and packed with useful features that I'd been missing.
@ATXJane you're welcome!
@john_b ProtonMail user here. Good to know about Fastmail. Thanks!