Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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My suggestion is, get yourself a domain with email included (I know a few european providers that I tested personally but I bet most of them include a mail service, even if it isnt advertised in the product page), can be had for as cheap as 6€/year. Test it out see if it's enough and it works with third party email clients that you like.
Then later you can also purchase a dedicated mail service on top (but separately) of your domain, starting from 1€/month usually; the advantage to just the barebone approach is a nicer dedicated web interface, apps, support, etc. But it's optional.
I'm wary instead of these all-in-one hefty and pricy (for personal use) services like Proton, do we really need all this interoperability between a drive storage and email and calendar? I think that's the job of the operating system. Is copy-pasting a link to a different app really that inconvenient?