German business email and office suite (mail, calendar, contacts, cloud storage) run by Heinlein Hosting GmbH in Berlin.

mailbox.org is an ad-free email and collaboration suite operated by Heinlein Hosting GmbH, registered in Berlin, Germany.

Beyond email it bundles calendar, contacts, cloud file storage, an office document suite, and PGP encryption support, running on its own hardware in ISO-27001-certified German data centers powered by renewable energy.

Its status as a German-registered GmbH subjects it to German telecom secrecy law and GDPR, central to its privacy pitch to business and personal customers.