Email & calendar, in European hands.

• InfomaniakCH

  A Geneva provider with mail, calendar, kDrive, video meetings and hosting — entirely in its own Swiss data centres.

  SwitzerlandProvenEffort: Medium

  www.infomaniak.com ↗Replaces: Google Workspace · Microsoft 365

• mailbox.orgDE

  A Berlin provider with mailbox, calendar, contacts and office on an OX base, open standards, your own domains, renewable power.

  EU / EEAProvenEffort: Medium

  mailbox.org ↗Replaces: Gmail · Outlook / Exchange Online

• MailfenceBE

  A Belgian provider with OpenPGP key management inside the mailbox and no advertising or tracking in the business model.

  EU / EEASolidEffort: Small

  mailfence.com ↗Replaces: Gmail

• PosteoDE

  Radically data-minimal: anonymous sign-up, anonymous payment, no link between account and person, one euro a month.

  EU / EEAProvenEffort: Small

  CatchNo custom domains. For a company that mails from @yourfirm.com, that rules it out.

  posteo.de ↗Replaces: Gmail

• Proton MailCH

  A Swiss provider bundling end-to-end encrypted mail, calendar, storage and VPN in one subscription, held by a foundation.

  SwitzerlandProvenEffort: MediumOpen source

  CatchSwitzerland, not the EU. An adequacy decision exists, but Swiss surveillance law applies — and IMAP only works through the local bridge.

  proton.me ↗Replaces: Gmail · Outlook / Exchange Online

• TutaDE

  A Hanover provider with end-to-end encryption reaching into the search index, and a key generation already hardened against quantum attacks.

  EU / EEAProvenEffort: MediumOpen source

  CatchNo IMAP and no SMTP. Outlook, Thunderbird and any script that sends mail must go through Tuta's own apps or its bridge.

  tuta.com ↗Replaces: Gmail · Outlook / Exchange Online

Every field, filter and catch lives in the full directory. Not a recommendation and not a review. A list with evidence, so you can draw up a shortlist. Ownership and headquarters change — verify whatever matters to you before you sign.

Data as of August 2026