Data protection is in our DNA
mailbox.org is run by experts in secure, data protection-compliant communication. Heinlein Support is the company that operates the e-mail provider and has over 30 years of industry experience. Since its founding in 2014, mailbox.org has grown and developed to offer users a comprehensive communication platform poised to compete with the big players in the market.
With us, you don't need to worry about discussions with your data protection officer. We are a provider from Germany with two server locations in Berlin. We have experience with the demanding requirements profile of public authorities and educational institutions. Our specialists have data protection and security well in sight.
Data centres in Germany
No vendor lock-in
Access management
PGP with web-mail
Spam-/ virus protection
IMAP, POP3 and SMTP
Administrator overview
TLS 1.3 where possible
No unnecessary data collection
Login with single sign-on (SSO)
German quality & security
The highest German quality standards for your digital communication. Your sensitive data remains in Germany and is protected by the strictest data protection laws – for maximum security and reliability.
Public authorities and organisations who put their trust in mailbox.org
Success stories
Discover why companies, authorities and the public sector across Europe rely on mailbox.org.




Admin interface & API
The administration interface for your organisation's administrator provides all required information in a single place. Admins can perform all kinds of common tasks such as setting up mailboxes, changing price plans for individual users, or resetting user passwords.
- Easy setup of your domain names
- Straightforward configuration of employee inboxes
- Individual feature adjustment
- API available

Your tailor-made mailbox
We know from experience that every organisation has its unique requirements and processes. For some customers, the e-mail inbox with plenty of extra mail storage is enough, while others use the all-in-one package with e-mail, cloud storage, online office and video conferencing. We offer you a customised solution without unnecessary costs.
In addition, your account administrator receives support through our e-mail ticket system or, if required, access to our 24/7 emergency hotline. We also offer 1st level support for your employees and training courses on request.
We are also happy to support you with migration and integration into existing systems. Just get in touch with us.