AFAIR none of those allow sending and receiving calendar invitations, that interfunction with outside services (eg Outlook.com, Gmail, Apple). Proton does. Send a calendar invitation from gmail/outlook/Apple to a Proton user; they can accept it and it will automatically add to their calendar and send back an acceptance email that gmail/etc understands. Vice-versa also true.
I trialled almost all of those before I ended with Proton, because it was the only one that felt like they actually tried to get calendar and email functionality on par with major (non-privacy focussed) service providers, and in general was the most polished.
They are all fine if literally all you need is simple email though.
There are a lot of EU emails providers not just proton.
Just to list some:
mailbox.org
posteo.de
soverin.com
tutanota.com
infomaniak.com
mailo.com
Also this https://european-alternatives.eu/
edit: general speaking, too much proton.
AFAIR none of those allow sending and receiving calendar invitations, that interfunction with outside services (eg Outlook.com, Gmail, Apple). Proton does. Send a calendar invitation from gmail/outlook/Apple to a Proton user; they can accept it and it will automatically add to their calendar and send back an acceptance email that gmail/etc understands. Vice-versa also true.
I trialled almost all of those before I ended with Proton, because it was the only one that felt like they actually tried to get calendar and email functionality on par with major (non-privacy focussed) service providers, and in general was the most polished.
They are all fine if literally all you need is simple email though.
Tuta does.
Source: I use Tuta as my main driver.
Thanks for the info!
@roserose56 @blinfabian
runbox.com