We are mailbox
For decades, we have been committed to free communication on the Internet – not just as observers, but as active players. While large commercial providers are increasingly taking over the free Internet, prioritizing economic interests, we remain true to our core principles: communication must remain secure, independent, and freely accessible for all. In our digital age, we believe this is how it should be.
Security is our core. We create digital freedom and offer a clear alternative to surveillance and control. This is digital sovereignty from Europe and for the world.
Our back-up
We stand on the shoulders of the Heinlein Group – real experts with over 30 years of experience, who work for our communication to remain secure and free from surveillance. With more than 150 permanent employees, Heinlein Support is one of Germany’s leading specialists in networking, Linux and email. They support the administrators of thousands of companies and numerous (email) providers – in person through Linux consulting, by offering emergency support, through training courses run by their Heinlein Academy, and their secure and sophisticated server hosting in German data centres.

Transparency report
Public authorities may request customer data or, by way of court order, their inbox and log data. Every request will be carefully screened by our data protection officer. In case of any doubt, we consult specialised lawyers. You can rest assured that we will always reject any unlawful requests.
🍃︎ Sustainability
Our servers in the Berlin data centres and our offices also use electricity from renewable sources. For travel, we aim to use trains and a local car-sharing scheme, whenever possible. If a flight cannot be avoided, we compensate for the increased emissions output through atmosfair.
⤢ Open Source
We rely on Linux and open-source software and actively contribute to its development and distribution. We support events such as the Chemnitz Linux Days, organisations such as Digitalcourage e.V., the Tor network, and Free Software Foundation Europe (FSFE).

Our history
2024–2025
Shaping the futureIn 2024, we celebrated our 10th anniversary and launched the official beta programme for continuous innovation. In 2025, we received the "Software made in Germany" and "Software hosted in Germany" awards, which officially confirmed our quality. With the rebrand to "mailbox", we're modernising our brand identity and have developed the completely redesigned mailbox Suite.
2022–2023
Innovation from EuropeBSI certification confirmed our highest security standards. 2022 also marked the launch of OpenTalk – our GDPR-compliant video conferencing solution from Europe – as an important milestone for digital sovereignty. At the same time, we introduced Framadate for scheduling and Etherpad for collaborative text editing. In 2023, we completed our security portfolio with S/MIME integration for business customers.
2020–2021
The platform takes shapeIn 2020, we expanded our web portal with secure video conferencing and developed into a comprehensive communication solution. In 2021, we introduced TLS 1.3 as well as flexible tariffs (LIGHT, STANDARD, PREMIUM) with professional telephone support to optimally serve different user needs.
2017–2019
Growth and designWith a complete website relaunch in 2018 and modern design, we opened mailbox.org to a broader audience. The further development of our security features set new standards. At the same time, we began expanding into a complete communication platform with enhanced office functions.
2014–2016
The secure beginningThe founding of mailbox.org began with the innovative "encrypted mailbox" as a secure alternative to international providers. In 2015, we introduced the mailbox.org Guard with PGP encryption in the browser and became the test winner at Stiftung Warentest. In 2016, our success was confirmed with another "Very Good" rating (1.4) and top marks for security and privacy.
1998–2013
From youth project to providerWhat began in 1989 as a school newspaper project called ‘JPBerlin’ soon developed into one of the first providers of Internet access and web hosting for ‘ordinary’ people. Even as a teenager, our current CEO Peer Heinlein was already setting standards: PGP encryption was a matter of course from the very beginning, and we were also among the first to introduce spam and virus filters in 1998. In 2004, Heinlein Professional Linux Support GmbH was founded, which then became Heinlein Support GmbH in 2012. When Snowden revealed the NSA's surveillance activities in 2013, it was the starting signal for us to launch mailbox.org.

What our customers say about us
We chose mailbox because it is one of the best-known and most secure German email providers. Since mailbox invests heavily in the open source community, we want to give something back to the community.
SENEC GmbH
We greatly appreciate mailbox because the issues that are at the forefront of mailbox are also what drive us in our daily work: security, data sovereignty, functionality – all based on open source software.
As a provider of IT security services, we set the highest standards in terms of data protection, information security and transparency. mailbox offers us reliable communication solutions that far exceed current standards.
xoDynamics GmbH
As the operator of a large platform, we rely on the reliable delivery of large volumes of emails. mailbox has proven to be an excellent partner in this regard. Up-to-date security technologies, a high level of data protection and, of course, servers powered by green electricity make us completely satisfied!
foodsharing.de
Security and sovereignty in communication have never been as important as they are today. Contrary to the global trend of entrusting this communication to data giants such as Google, Facebook and Co., mailbox has created a secure communication platform that we can recommend to all our customers with a clear conscience.
datenhain GmbH
We have been impressed by mailbox since 2017. In addition to email, it also offers shared folders and calendars for our daily work. Another plus is that we have experienced hardly any downtime during our time using the service.
ASPHALTA Ingenieurgesellschaft für Verkehrsbau mbh
mailbox runs smoothly for us in everyday use. In addition to secure email communication, we also appreciate the ease of use of the file storage system, which allows the school administration and teachers to make documents available to our students and parents for download.
ARE Gymnasium
We are very grateful for the fast, uncomplicated service and the personal and competent support.
oncampus GmbH
We have been with mailbox since 2017 – the decisive factors in our decision were the server location in Germany and the integrated option for mutual calendar sharing within the team.
Verkehr mit Köpfchen
Data protection is firmly anchored in our DNA, and we work exclusively with German partners in all sensitive areas. The professional mail hosting service provided by mailbox fits perfectly with our data protection strategy.
Speicherhafen GmbH & Co. KG
Unlike the tech giants, mailbox does not engage in surveillance capitalism. The digital footprint of students is minimised. An excellent solution for schools that take the data protection and privacy of their school community seriously.
Gymnasium und ORG Dachsberg
As a young cooperative, email addresses with our own domain are very important to us, and we were impressed by mailbox's commitment to data protection. We also really like the video conferencing feature, which we use extensively in various working groups.
Grüner Weiler eG
Our high standards for food also apply to software: a partner who is committed to a free internet and open source software is a perfect fit. We use mailbox as cloud storage for backups of our cash register and emails.
Biomarkt Vollmerhausen
Business mailbox provides us with email, address book and calendar services from a single source. At the same time, security and data protection are not just ticked boxes, but are actively practised. This combination was decisive for us.
ComputerBase GmbH
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