Get an outbound email event by id

{
    "attachments": [
        {
            "extension": "xlsx",
            "kind": "unspecified",
            "name": "Q4-Report.xlsx"
        }
    ],
    "destination_domain": "example.com",
    "destination_email": "jane.doe@example.com",
    "direction": "external_destination",
    "id": "8CA67511-744C-4D74-B26E-7281CF88712F",
    "message_id": "<abc123@mail.company.com>",
    "sender_email": "john.smith@company.com",
    "sender_name": "John Smith",
    "source": "unspecified",
    "subject": "Q4 Financial Report",
    "timestamp": "2021-01-01T00:00:00Z",
    "total_attachments_size": 348160
}