jmap-kit
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    EmailSubmissionObjectServerSet: Readonly<
        {
            deliveryStatus: Record<string, DeliveryStatus>
            | null;
            dsnBlobIds: Id[];
            id: Id;
            mdnBlobIds: Id[];
            sendAt: UTCDate;
            threadId: Id;
        },
    >

    EmailSubmissionObject properties set by the server. These cannot be set by an EmailSubmission/set call.