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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You don't have to do anything else with the domain, it'll work fine for email only.
You could add it to Proton, take your time to migrate all your accounts, then dip. Or you could just go straight to a new provider with the domain, and take your time transitioning accounts to the custom domain over time that way. Assuming Proton's free offering is sufficient, you can always keep it around and set up forwarding to your custom domain.
Regarding domain name setup itself, Proton should provide steps for how to do it correctly, but I found them to be a bit fiddly (might have improved, this was a few years ago) - when I moved to Zoho I found it really easier. If you're using Cloudflare for the domain registration, Zoho can basically do it all automatically (click a few links link and accept the proposed changes).
Thanks! I registered a domain with cloudflare and that was easy enough. I’ll read up on some alternative providers and see how this all shakes out.