Mailbox.org

Mailbox.org is a privacy-oriented email and productivity service operated by Heinlein Hosting GmbH, founded in 2014 and headquartered in Berlin, Germany. Built by a team with deep roots in the German email hosting community, Mailbox.org was created as a direct response to growing concerns about mass surveillance and data mining by major US email providers. The service emphasizes transparency, privacy, and sustainability.

The platform provides ad-free email with PGP encryption support, calendar and contacts syncing via CalDAV and CardDAV, cloud storage with file editing capabilities, a spreadsheet tool, and a presentation editor. Mailbox.org supports custom domains, catch-all addresses, IMAP/POP3/SMTP access, and offers built-in guard features to strip tracking pixels and external content from emails. The service is fully compatible with standard email clients including Thunderbird, Outlook, and mobile apps.

As a Berlin-based company, Mailbox.org operates its servers exclusively in German data centers and is fully compliant with GDPR and German data protection law (BDSG). The service has been recognized by the German consumer protection organization Stiftung Warentest and is a popular choice for privacy-conscious individuals and businesses in the DACH region who want a professional, full-featured email service without the privacy trade-offs of free ad-supported providers.