Mailbox.org
✓ Verified by EU AltsSecure German email, calendar and cloud office — a privacy-focused alternative to Gmail.
Overview
Mailbox.org is a Berlin, Germany-based European company building email and privacy software since 2014. EU Alts has verified that Mailbox.org owned by Heinlein Support GmbH (Germany) — mailbox.org operates under Heinlein Hosting GmbH, a wholly-owned German subsidiary (Germany), and hosts customer data with Self-hosted on own hardware (no third-party cloud provider) in Germany (two datacenters in Berlin) and operates under GDPR, outside the reach of the US CLOUD Act — a privacy-friendly alternative to Gmail and Outlook 365 for European teams.
Why European teams pick Mailbox.org
Teams in Europe pick Mailbox.org when they want a email provider that bills in EUR, supports their local data-protection officer requirements, and keeps customer data under Germany law, operating since 2014. Compared with Gmail and Outlook 365, Mailbox.org avoids cross-border data transfers under Schrems II and the US CLOUD Act — a fact EU Alts has verified, not just assumed from its EU headquarters.
See more EU email tools or browse other startups from Germany.
About
Mailbox.org is a German email provider offering encrypted email, shared calendars, contacts and cloud office tools. Powered by renewable energy and fully GDPR compliant.
Details
- Founded
- 2014
- Headquarters
- Berlin, Germany
- Ownership
- Owned by Heinlein Support GmbH (Germany) — mailbox.org operates under Heinlein Hosting GmbH, a wholly-owned German subsidiary (Germany)
- Hosting
- Self-hosted on own hardware (no third-party cloud provider), Germany (two datacenters in Berlin)
- CLOUD Act
- Not exposed
- Company size
- 11–50 employees
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Frequently asked questions
What is Mailbox.org?
Mailbox.org is a German email provider offering encrypted email, shared calendars, contacts and cloud office tools. Powered by renewable energy and fully GDPR compliant.
What does Mailbox.org do?
Mailbox.org is secure german email, calendar and cloud office — a privacy-focused alternative to gmail. It is listed under email and privacy on EU Alts because its core functionality serves teams looking for a European email tool with EU data residency, typically as a switch away from Gmail and Outlook 365.
Is Mailbox.org a good European email alternative?
Mailbox.org is a fit for European businesses evaluating email options where data residency and GDPR alignment matter — typical buyers include EU-based SaaS teams, public-sector projects, regulated industries (healthcare, finance, legal), and any organisation that needs to demonstrate that customer data does not leave the EU. It also overlaps with privacy use cases.
Is Mailbox.org GDPR compliant?
Mailbox.org is headquartered in Berlin, Germany and falls under EU jurisdiction, so it processes user data under the GDPR by default. Customer data processing is supervised by Germany's data protection authority, the Bundesbeauftragte für den Datenschutz und die Informationsfreiheit (BfDI). EU Alts has verified that Mailbox.org owned by Heinlein Support GmbH (Germany) — mailbox.org operates under Heinlein Hosting GmbH, a wholly-owned German subsidiary (Germany), and hosts customer data with Self-hosted on own hardware (no third-party cloud provider) in Germany (two datacenters in Berlin), so it is not subject to the US CLOUD Act — meaning US authorities cannot compel Mailbox.org to disclose customer data the way they can with Gmail and Outlook 365. For European buyers, that often simplifies DPIA paperwork and standard contractual clauses.
How do teams switch from Gmail to Mailbox.org?
Most teams move to Mailbox.org from Gmail and Outlook 365 because they want EU data residency without giving up the core email workflow. Mailbox.org's Germany base means a single jurisdiction for both the company and (typically) its hosting infrastructure, so you can drop Schrems II transfer impact assessments for this part of your stack. Plan the migration in stages: export your data from the US incumbent, pilot Mailbox.org with a small team, then move the rest once the integration coverage you need is confirmed.
Where is Mailbox.org based?
Mailbox.org is headquartered in Berlin, Germany. The company was founded in 2014. Its main website is https://mailbox.org.