{
    "type": "object",
    "properties": {
        "mailboxId": {
            "type": "number"
        },
        "messageId": {
            "type": "number"
        },
        "flag": {
            "type": "string"
        }
    },
    "required": [
        "mailboxId",
        "messageId",
        "flag"
    ],
    "additionalProperties": false
}