Also avoid using ProtonMail Bridge if you value your emails. It's been silently corrupting/deleting your emails for years now. And Proton hasn't done a single thing to warn users about it. Instead they've been working on a complete rewrite which is far from completion. Meanwhile people are still discovering that their emails are disappearing.

https://github.com/ProtonMail/proton-bridge/issues/29

https://github.com/ProtonMail/proton-bridge/issues/220