[JMAP] Re: Question about shareWith property in RFC 9670 vs RFC 8621

Neil Jenkins <neilj@fastmailteam.com> Wed, 01 October 2025 05:46 UTC

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Date: Wed, 01 Oct 2025 15:46:02 +1000
From: Neil Jenkins <neilj@fastmailteam.com>
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Subject: [JMAP] Re: Question about shareWith property in RFC 9670 vs RFC 8621
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Hi Mauro,

Apologies for the delay replying, I've been on vacation.

> I’m currently working on an implementation of RFC 9670, and I’ve run into something I’d like to clarify. In Section 4 (Framework for Shared Data), it says that shareable data types MUST define the properties isSubscribed, myRights, and shareWith. That all makes sense, but when I went back to RFC 8621, I couldn’t find a definition for the shareWith property.

You haven't missed anything! There's no current standard for *setting* ACLs for mailboxes via JMAP. It would be fairly trivial to define as an extension (basically just adding the *shareWith* property in accordance with RFC9670), but it's not currently defined. Perhaps you'd like to contribute a document for this?

Cheers,
Neil.