---
type: source
title: "E-Mail: Signieren & Verschlüsseln"
tags: [email, security, smime, pki]
related: [smime, e-mail-sicherheit]
created: 2026-06-30
updated: 2026-06-30
authors: []
year: 2026
url: "https://rz.uni-greifswald.de/dienste/allgemein/e-mail/e-mail-sicherheit/cert"
venue: "Universitätsrechenzentrum (URZ)"
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_e_mail_sicherheit_cert.md"]
---

# E-Mail: Signieren & Verschlüsseln

This source provides the foundational requirements and warnings for implementing cryptographic signing and encryption of emails at the Universität Greifswald.

## Prerequisites
To utilize email signing and encryption, users must already possess:
- A [[nutzerzertifikate]] or [[gruppenzertifikate]].
- The certificate must be available as a password-protected [[p12-file]].

## Critical Technical Constraints
- **Signature Validity**: An electronic signature is only considered valid if the certificate used to create it has not expired.
- **Private Key Dependency**: Access to encrypted emails is strictly dependent on the private key. If the private key is replaced or lost, the content of previously encrypted emails becomes inaccessible.

## Supported Implementations
The URZ provides detailed configuration guides for the following clients:
- [[groupware]] Webmailer
- [[microsoft-outlook]]
- [[mozilla-thunderbird]]

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