Apparently this marks the occasion that all of their non-beta apps are now open source.

Oh, bad timing. Just a few months ago I was on the fence about Protonmail vs Fastmail (vs all others) and ended jumping to Fastmail: the privacy pro didn't seem to outweigh the cons. Now with open sourcing stuff the pros do get somewhat better... But reevaluating and switching would be troublesome.... Maybe in a few years I'll revisit it :)

The pricing is very different. Fastmail allows unlimited domains where proton is almost double the cost for two.

Yeah protonmail charging for the marginally free stuff, like domains and aliases is very disappointing. I make a new email for every account, in the form of [email protected] do I have to pay proton mail $24/month for that privilege?

Also not providing 20GB space as a default paid option in this day in age of $5/month/TB is also very disappointing.

Well, not just pricing or privacy or domains, there's a lot that's different. That's why I mentioned weighing pros vs cons.

Does fastmail offer encrypted server side email though?

I've been with ProtonMail a couple of years now, and recently made the step to buy my own domain to use for personal email. What I'm hoping is that whenever I want to switch provider in the future, it won't be any more trouble than to switch some DNS settings :)

The easiness to migrating away was one of the cons of Proton Mail to me, but I don't remember the exact reasons for it besides not using standard protocols. Having standard protocols really makes everything easier. With the open sourcing of the tools, maybe it will get better?

Interesting. I run rainloop on my (local) server so I can have mail in my browser (while on my lan). I'll have to see if I can get bridge for linux working with that. Server is headless, so hopefully bridge is too...

Bridge is GUI by default but has command line switch for headless.

Now all they need to add is hardware 2FA key support. It's on their roadmap and supposedly development is nearly done.