---
type: concept
title: Sieve-Filter
tags: [email, filtering, automation]
related: [central-email-service]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_support_dokumentation_anleitungen_informationssammlung.md"]
---

# Sieve-Filter

**Sieve-Filters** are server-side email filtering rules used within the university's [[central-email-service]]. 

Unlike client-side filters (which only run when an email client like [[mozilla-thunderbird]] is open), Sieve filters are executed directly on the mail server. This allows for the automatic sorting, redirecting, or deleting of emails regardless of whether the user is currently logged in. They are categorized as an "extension" or "special feature" for users seeking improved communication and networked collaboration.
