RFC 5183 · PROPOSED STANDARD · 2008
SUN · 14 JUN 2026
Sieve Email Filtering: Environment Extension
Overview
RFC 5183, “Sieve Email Filtering: Environment Extension”, is a Proposed Standard document published in May 2008 by N. Freed. The canonical text is published by the RFC Editor.
Abstract
This document describes the "environment" extension to the Sieve email filtering language. The "environment" extension gives a Sieve script access to information about the Sieve interpreter itself, where it is running, and about any transport connection currently involved in transferring the message. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 5183 is hosted at rfc-editor.org. Available in TXT,HTML.
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