Re: [secdir] Secdir last call review of draft-ietf-jmap-core-12

"Neil Jenkins" <> Tue, 08 January 2019 02:54 UTC

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Date: Mon, 07 Jan 2019 21:54:32 -0500
From: "Neil Jenkins" <>
To: "Barry Leiba" <>, "Tero Kivinen" <>
Cc: "Benjamin Kaduk" <>, "IETF JMAP Mailing List" <>, "Kurt Andersen (IETF)" <>,, iesg <>,
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Subject: Re: [secdir] Secdir last call review of draft-ietf-jmap-core-12
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On Tue, 8 Jan 2019, at 12:22 AM, Tero Kivinen wrote:
> There is already huge difference in sharing mail and sharing
> calendars. Most of the calendars support easy way of sharing only
> limited set of data, i.e., you can mark entries as private where those
> will not be shared out, or will be shared out only as "busy", i.e.,
> you can only see person is not available but not what calendar entry
> is.
> In mailboxes we do not have that kind of features. One thing we could
> suggest to implementors to allow sharing subfolders of the actual
> account instead of full mailbox,

Err, not sure what you're talking about here. Most email systems already support sharing on a per-folder (or *mailbox* as they're called in IMAP and JMAP) granularity. That's why JMAP and IMAP can return you a "myRights" object with your permissions for each mailbox. Calendars are identical; you generally share on a per-calendar basis (which acts the same as a mailbox for mail; a collection of individual data items).