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. As an EU-headquartered provider, Mailbox.org likely operates under GDPR. EU Alts has not independently confirmed its exposure to the US CLOUD Act — the ownership and hosting facts recorded for it do not establish that it is outside the Act's reach — see the Details section below for what's known so far.
Why European teams pick Mailbox.org
Teams in Europe consider Mailbox.org when they want a email provider that bills in EUR, operating since 2014. Its EU headquarters is a good sign compared with Gmail, but EU Alts has not independently verified Mailbox.org's exposure to the US CLOUD Act — check the Details section for the recorded facts.
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 independently verified
- Verified
- 2026-07-31
- Last checked
- 2026-07-31
- Company size
- 11–50 employees
Compare with the US product you may be replacing
Mailbox.org is listed in a category that our US-product comparison pages cover. See every EU option side by side:
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Frequently asked questions
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.
Is Mailbox.org GDPR compliant?
Mailbox.org is headquartered in Berlin, Germany and falls under EU jurisdiction, so it likely 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 not independently verified Mailbox.org's exposure to the US CLOUD Act, so we can't confirm it either way.
How do teams switch from Gmail to Mailbox.org?
Teams considering a move from Gmail to Mailbox.org are usually drawn by its email workflow fit. EU Alts has not independently verified Mailbox.org's exposure to the US CLOUD Act, so treat any CLOUD Act or Schrems II conclusions as provisional. Plan a migration in stages regardless: export your data from the US incumbent, pilot Mailbox.org with a small team, then move the rest once integration coverage 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.