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When handling a POST request on a scheduling Outbox collection:

1. Servers MUST verify that the principal associated with the calendar user address specified in the "ORGANIZER" property of the scheduling message data in the request contains a CALDAV: schedule-outbox-URL property value that matches the scheduling Outbox collection targeted by the request.

2. Servers MUST verify that the currently authenticated user has the CALDAV:schedule-send privilege, or a sub-privilege aggregated under this privilege, on the scheduling Outbox collection targeted by the request. 3. Servers MUST only return valid freebusy information for recipients when the CALDAV:schedule-deliver privilege, or a sub-privilege aggregated under this privilege, is granted on the recipient's scheduling Inbox collection for the principal associated with the DAV:owner of the scheduling Outbox collection targeted by the request.

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