---
type: source
title: "URZ: Spam- & Virenschutz"
tags: [email, security, spam, virus-protection]
related: [email-spam-virus-protection, phishing-prevention, ums]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_spam_virenschutz.md"]
---

# URZ: Spam- & Virenschutz

This source documents the spam and virus protection measures implemented by the Universitätsrechenzentrum (URZ) for the university's email infrastructure.

## Key Protection Measures
- **Greylisting**: Used for incoming emails to reduce spam.
- **Real-time Scanning**: All incoming, outgoing, and internal emails are scanned for spam and viruses in real-time.
- **Immediate Rejection**: Emails that are not declared "clean" or contain non-scannable attachments (e.g., password-protected documents) are rejected immediately. The sender is notified instantly, eliminating the need for quarantine zones or tagging.
- **Internal Scanning**: Internal university emails are also scanned, as they can serve as vectors for infection.

## Sending Limits (Ratelimits)
To prevent abuse from compromised accounts, the URZ enforces the following limits:
- **Daily Limit**: 200 emails per 24 hours per user.
- **Hourly Limit**: 300 recipients per hour.
- **Verification**: The system checks if the sender address matches the account of the sending user.

Users receive a "Rate Limit exceeded" message when these limits are hit.

## User Recommendations and Phishing
- **Local Filters**: The URZ strongly recommends disabling local spam filters to avoid false positives, asserting that the central system is highly reliable.
- **Phishing**: The URZ explicitly states that **phishing is not spam**. Phishing consists of targeted attacks rather than mass mailings, meaning standard spam filters often fail to catch them. Users are urged not to react to phishing emails and to report them so the URZ can implement individual filters.

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