Soverin

Soverin's whole pitch is a plain promise: nobody reads your mail and nobody sells it.

The Standard plan bundles a mailbox with a custom domain from about €3.25 a month, includes unlimited aliases on that domain, and syncs calendars and contacts over CalDAV and CardDAV rather than a proprietary app. Soverin states plainly that it never scans messages beyond automated spam filtering and strips the sender's IP address from outgoing headers, a smaller but concrete privacy step most mainstream providers skip.

Soverin B.V. is based in Amsterdam and processes data only in Dutch data centres, which places it under Dutch and EU law without the adequacy-decision question that applies to the Swiss providers here. There is no free tier to test with; instead Soverin offers a 30-day money-back guarantee, and billing is annual only, so evaluating it means committing to a year up front rather than a monthly experiment.

The gap against StartMail and the two encrypted providers is PGP: Soverin does not build in native OpenPGP the way StartMail does, so anyone who wants encrypted correspondence has to layer a browser extension on top themselves. What Soverin trades for that is a lower price and a simpler product, with one plan, one price and no upsell ladder.

What Soverin does well

• Unlimited aliases on your own custom domain
• States plainly that it never scans email content
• Dutch data centres only, under EU law
• CalDAV/CardDAV sync works with any calendar app
• 30-day money-back guarantee

Where Soverin falls short

• No native PGP; encryption needs a separate browser extension
• No free tier, annual billing only
• Fewer bundled apps than Mailbox.org or Kolab Now
• Smaller company, with less published security auditing than Proton Mail

Standout feature. Soverin's written promise not to scan mail content, backed by Dutch-only data residency, is close to its whole product in one sentence.