Sieve Email Filtering: Delivery by MAILBOXID
RFC 9042, “Sieve Email Filtering: Delivery by MAILBOXID”, is a Proposed Standard document published in June 2021 by B. Gondwana. It updates RFC 5228. The canonical text is published by the RFC Editor.
Abstract
The OBJECTID capability of IMAP (RFC 8474) allows clients to identify mailboxes by a unique identifier that survives renaming.
This document extends the Sieve email filtering language (RFC 5228) to allow using that same unique identifier as a target for fileinto rules and for testing the existence of mailboxes.
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 9042 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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