---
type: source
title: "Groupware E-Mail Module: Signing & Encryption"
tags: [groupware, smime, certificates, email-security]
related: [groupware, smime, nutzerzertifikate]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_groupware_module_email_smime.md"]
---

# Groupware E-Mail Module: Signing & Encryption

This source provides instructions on using the [[groupware]] E-Mail module for digitally signing and encrypting emails.

## Key Requirements
- **Signing**: To sign emails, users must possess a [[nutzerzertifikate]] (DFN-PKI user certificate).
- **Import Process**: Both the private key and the certificate must be imported into the Groupware E-Mail module to enable signing capabilities.
- **Purpose**: The primary goal of signing is to ensure the sender is verifiable.

## Operational Constraints
- **Single Certificate Limit**: The Groupware E-Mail module supports only one certificate per email account.
- **Renewal Workflow**: When renewing or replacing a certificate, the existing "old" certificate must be removed from the system before the new one can be imported.

## Support
Technical issues are handled by the [[universitatsrechenzentrum-urz]] via the [[groupware]] ticket system or the URZ hotline (ext. 1420).