RFC 5173 · PROPOSED STANDARD · 2008
WED · 29 JUL 2026
Sieve Email Filtering: Body Extension
Overview
RFC 5173, “Sieve Email Filtering: Body Extension”, is a Proposed Standard document published in April 2008 by J. Degener, P. Guenther. It updates RFC 5229. The canonical text is published by the RFC Editor.
Abstract
This document defines a new command for the "Sieve" email filtering language that tests for the occurrence of one or more strings in the body of an email 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 5173 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
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