Network Working Group B. Gondwana Internet-Draft Fastmail Pty Ltd Updates: RFC8474 (if approved) 23 July 2025 Intended status: Standards Track Expires: 24 January 2026 IMAP OBJECTID Partial Implementation extention draft-gondwana-mailmaint-imap-objectid-partial-00 Abstract This document extends the IMAP OBJECTID specification in RFC8474 describes persistent identifiers for Mailboxes, Emails, and Threads in email. Some servers may be unable to provide persistent identifiers for one of these but be able to provide data for others, so this extension allows a server to specify that it can provide some reliable ids without needing to implement all data types. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 24 January 2026. Copyright Notice Copyright (c) 2025 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components Gondwana Expires 24 January 2026 [Page 1] Internet-Draft IMAP OBJECTID Partial July 2025 extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. OBJECTID=MAILBOX . . . . . . . . . . . . . . . . . . . . . . 2 2. OBJECTID=EMAILID . . . . . . . . . . . . . . . . . . . . . . 2 3. Supporting multiple datatypes . . . . . . . . . . . . . . . . 2 4. IANA considerations . . . . . . . . . . . . . . . . . . . . . 2 5. Security considerations . . . . . . . . . . . . . . . . . . . 2 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 7. Normative References . . . . . . . . . . . . . . . . . . . . 3 Appendix A. Changes from Earlier Versions . . . . . . . . . . . 3 Appendix B. draft-gondwana-imap-objectid-partial . . . . . . . . 3 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 3 1. OBJECTID=MAILBOX If a server has the capability OBJECTID=MAILBOX then it supports the objectids for mailboxes described in [OBJECTID] section 4. 2. OBJECTID=EMAILID If a server has the capability OBJECTID=EMAILID then it supports the objectids for emails (and optionally threads) described in [OBJECTID] sections 5 and 6. 3. Supporting multiple datatypes An implementation which supports both MAILBOXID and EMAILDID SHOULD only issue the capability OBJECTID as defined in [OBJECTID]. Clients MUST accept any combination of capabilities to decide which requests to send. 4. IANA considerations IANA is asked to register the capabilities OBJECTID=MAILBOX and OBJECTID=EMAILID with a reference to this document. 5. Security considerations This document does not introduce any security considerations beyond those described in [OBJECTID]. Gondwana Expires 24 January 2026 [Page 2] Internet-Draft IMAP OBJECTID Partial July 2025 6. Acknowledgements Daniel Eggert, Ken Murchison, Matt Diephouse, the bar at Melia Castilla in Madrid. 7. Normative References [OBJECTID] Gondwana, B., Ed., "IMAP Extension for Object Identifiers", RFC 8474, DOI 10.17487/RFC8474, September 2018, . Appendix A. Changes from Earlier Versions [[This section to be removed by RFC Editor]] Appendix B. draft-gondwana-imap-objectid-partial * Initial version Author's Address Bron Gondwana Fastmail Pty Ltd Level 2, 114 William Street 3000 Australia Phone: +61 457 416 436 Email: brong@fastmailteam.com Gondwana Expires 24 January 2026 [Page 3]