BSI C5 attestation: Seal of quality for data security
The Cloud Computing Compliance Criteria Catalogue (C5) is a catalogue of criteria developed specifically for cloud providers that raises the information security, availability and confidentiality of your data to a tested and transparent level. It was developed by the BSI to ensure the highest security and compliance requirements, particularly in sensitive areas such as public authorities or the healthcare industry. "We are very proud of this certification. It is another clear signal to our customers that their data is subject to the strict tests and controls required for the German and European markets and sensitive applications," says our founder and CEO Peer Heinlein.
Criterion for provider selection with growing relevance
For more and more industries and public institutions, the BSI C5 certification is becoming a relevant or even mandatory criterion when selecting their partners. ‘mailbox has been committed to data security for years. We are therefore particularly pleased that the certificate officially confirms this,’ says Peer Heinlein. ‘Our customers can rely on certified cloud security and the highest level of information security, as evidenced by our ISO 27001 certification and other awards.’
mailbox: ISO 27001 certified and awarded quality seals
ISO/IEC 27001 is the international standard for information security management systems (ISMS). It offers organisations a systematic approach to protecting their information. Specifically, this approach helps to identify, assess and control risks to the confidentiality, integrity and availability of information.
In addition, mailbox 2025 has been awarded the ‘Software made in Germany’ and ‘Software hosted in Germany’ quality seals by the German Federal Association of IT SMEs (BITMi). mailbox has also achieved gold status as part of the BSI's Email Security Year 2025. We are committed to the full implementation of state-of-the-art email security standards and have already successfully implemented them. This makes us one of the industry leaders in email security and data protection.
Put your trust in certified cloud security and learn more about mailbox's secure digital workplace.
