Sieve Email Filtering: Relational Extension
RFC 5231, “Sieve Email Filtering: Relational Extension”, is a Proposed Standard document published in January 2008 by W. Segmuller, B. Leiba. It obsoletes RFC 3431. The canonical text is published by the RFC Editor.
Abstract
This document describes the RELATIONAL extension to the Sieve mail filtering language defined in RFC 3028. This extension extends existing conditional tests in Sieve to allow relational operators. In addition to testing their content, it also allows for testing of the number of entities in header and envelope fields.
This document obsoletes RFC 3431. [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.
The canonical text of RFC 5231 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 5230 Sieve Email Filtering: Vacation Extension
- RFC 5232 Sieve Email Filtering: Imap4flags Extension
- RFC 5229 Sieve Email Filtering: Variables Extension
- RFC 5233 Sieve Email Filtering: Subaddress Extension
- RFC 5228 Sieve: An Email Filtering Language
- RFC 5234 Augmented BNF for Syntax Specifications: ABNF
- RFC 5227 IPv4 Address Conflict Detection
- RFC 5235 Sieve Email Filtering: Spamtest and Virustest Extensions