Posteo is probably what you're after. Only €1 per month!
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I'm also still using Proton for email and calendar, but I've heard about Fossify Calendar and have been meaning to look into it.
For contacts I have a Nextcloud instance running that I sync my contacts up to and use the stock GrapheneOS contacts app.
Fossify Calendar is a standard android calendar that pulls from the built-in android calendar storage. You can use any standard calendar like Fossify or Etar to mention two open source apps, much in the same way that you sync your nextcloud contacts to the built-in android contact storage. Any standard contacts app can interact with your nextcloud-stored'n'synced contacts.
Running Nextcloud for tasks, calendar and contacts on a self-hosted server is one of the more private solutions.
Mailbox.org I think has that. I haven't tried them, but check their pricing. I believe their 3€/mo tier has everything you're looking for
Oh I've heard of this one; They look great! I think the only thing they don't have is a mobile app :(
How much privacy respect do you feel you need? Self-hosting that stuff is the holy grail.
If main focus is deliverability and encryption plus privacy
You can try with mailbox or posteo with email, and self host etesync for calendar
Great to know the options, but are they open source? Without being open source we have no way to confirm if the e2ee is true or self-claimed.
I have been using proton mail for many years and will continue to use it. It's a good, privacy respecting project with a reasonable price attached to it. Who cares what the CEO thinks about politics.
I also don't like that Proton doesn't fully encrypt their contacts.
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