Portal

Encrypted Communication without Keys

Back to Overview

Why an Email Portal?

Recipients without their own certificates often pose an obstacle for encrypted communication.

PDF containers are considered a known alternative - but they bring media breaks and no real reply option.

The portal in mail:u secure is the standard way for these cases.

It enables secure email communication - even without prior keys - via a browser-based interface.

Automatic Rule Application

When does the Portal Rule Apply?

Whenever an email lacks a valid public key for the recipient, the portal rule can automatically apply.

Instead of an unencrypted mail or PDF container, a notification with access link is sent.
Portal Rule - Missing Key Scenario - Portal Access for Recipients without Key Material
Portal Screen - So funktioniert der Versand via Portal - Portal Process Overview

Process Overview

How Portal Delivery Works

Portal delivery occurs automatically when no valid public key is available for the recipient. Here is the complete process:

• Message is encrypted and stored in the portal
• Recipient receives notification with individual link
• After authentication, they can read the message
• Reply and file upload are possible directly via the portal
• Every action is fully logged

Over 99% of messages without keys are delivered via portal – PDF is only the exception. The process is fully automated and requires no manual intervention.

Technical Highlights

Portal pages fully tenant-capable

Separate portals for different tenants and organizations.

Content encrypted storage

All messages and attachments are securely encrypted.

Support for expiration date & automatic deletion

Automatic cleanup after defined time periods.

Logging & Tracing via OpenTelemetry

Complete traceability of all actions.

Optional: Portal branding in corporate design

Customization to your corporate design possible.

Integration of existing Identity Providers

Integration into existing customer databases and access systems.

Typical Use Cases

Sending sensitive documents

To customers, partners or patients with complete traceability.

Return channel for quote, contract or HR communication

Secure communication with reply option for business processes.

Ad-hoc encryption in B2B environment without PKI

Immediate secure communication without prior certificate management.

Decorative gradient background

Portal instead of PDF – experience the difference

Book a live demo and see how easy secure communication can be.

UPONU Logo

UPONU GmbH
Spandauer Str. 32
57072 Siegen
Germany

We develop and operate cloud solutions to meet your IT requirements of the future.

© 2025 UPONU GmbH