We wrote last week about Proton Mail adding an AI assistant that just sent a wafer-thin slice of your email in plaintext to sit on Proton’s servers — unlike the zero plaintext that was stored there…
IMO you gotta consider the email and calendar functions as inseparable, whereas the rest of the Google bundle can be teased apart. Privacy Guides is perhaps a bit too stingy with their recommendations, but at minimum they give you a lot of food for thought when they lay out their criteria:
Well, you know better than me, because I've never not used them together.
How do you, for example, invite people to things? Does your calendar just send an ICS attachment to Proton on SMTP? How do you RSVP for other people's invites? Do you download the event to your calendar and separately respond in proton? Do you get updates in the calendar app about other people's RSVP status, or just emails?
I rarely get calendar invites - much less ones that I have to respond to - to my personal Email account. I do on my work email, but I don't plan on self hosting that anytime soon.
Depends a lot on what you're looking for. If you just want email, then you have a lot of options. Mailbox.org, Posteo, tuta, mailfence, fastmail, and runbox all come to mind. If you want a full gsuite replacement, ala proton unlimited, then your options are limited.