Regardless of industry or company size: As soon as personal data is transmitted by email – such as customer data, health data, personnel files or supplier data – encrypted transmission according to GDPR is mandatory.
In addition to GDPR, many companies in research and development want to protect their know-how from access by third parties.
Furthermore, KRITIS requirements, the NIS2 directive and industry-specific compliance requirements (e.g., in insurance, healthcare or automotive) place additional demands on confidentiality, traceability and IT security.
Encryption is essential for both B2B and B2C communication. However, many mail servers or M365 environments do not offer end-to-end encryption or intelligent automation. This is exactly where mail:u Secure comes in.
Many conventional mail servers or standard mail solutions do not offer comprehensive control over email communication security.
Whether a message is actually transmitted encrypted depends in normal cases on the recipient server and the configuration in between – the sender usually has no influence on this.
With the widely used transport encryption (e.g., via TLS), the email is only protected until the next node in the transmission path. What happens after that is beyond the control and influence of the sender.
End-to-end encryption – i.e., one where the content cannot be viewed by anyone on the transmission path – requires additional measures. mail:u Secure provides this security: automated, rule-based and traceable.
mail:u Secure acts as an upstream crypto gateway and takes over the protection of your email communication – via SMTP or Microsoft Graph API:
Provision as SaaS in ISO-27001 data center or containerized in your private cloud or on-premises.
Contact us todayAutomated workflows for email processes with intelligent rule processing.
Learn More →Users in your company get the opportunity to intervene and receive information about the secure transmission of email and attachments.
Learn More →As an alternative to the portal application, emails and any attachments can also be transmitted in a PDF container.
Learn More →Automated Public Key Infrastructure for managing your S/MIME and PGP keys.
Learn More →Flexible operating models and seamless integration into existing IT infrastructures.
Learn More →Comprehensive compliance solutions and audit tools for regulatory requirements.
Learn More →Intelligent Email Processing
The rule-based email workflow engine usually replaces static rule sets that are based on sender and recipient with flexible policies. Each message is automatically processed according to recipient, sender, content or attachment classification – In addition to sender, recipient, content and attachments, the individual control commands of the user are also evaluated and integrated into the processing. (Outlook Add-in and Client Control). In addition to direct encryption and processing of emails, the Workflow Engine can become the central hub around email. Any third-party systems can be integrated into the routing. For example spam protection, archiving, sandbox, file processing, ERP processes etc.


Outlook Integration
The Outlook add-in shows a summarized result of the following sending before sending. Through a simple overview, the user learns whether the email can be sent according to the specifications:
This allows the user to very easily evaluate before sending whether the sensitive information can/may be sent in this way. In addition to viewing the processing, the user can specifically force or adjust encryption. These functions represent an optional way to involve the user in the decision with minimal effort, even without knowledge of encryption or leaving the familiar tools.
Industry-Specific Solutions

Our Unique Features
Multi-tenant operation in our ISO-27001-certified data centers from Germany
Helm charts for OpenShift, AKS, Rancher
Air-gapped for reinsurers & authorities

Practical Use Cases

Our white paper offers you a comprehensive insight into the latest technologies and best practices for secure communication. Discover how our customized solution mail:u secure efficiently secures your business processes.
By downloading the white paper, you agree to subscribe to our newsletter. This will be sent regularly to the e-mail address you have provided. You can revoke your consent at any time with effect for the future at UPONU GmbH or by using the unsubscribe link contained in the newsletter.
© 2025 UPONU GmbH