GatewayEmailInboundV1EnvelopeDto

{
    "contract": "gateway.email.inbound",
    "v": 1,
    "message_id": "string",
    "produced_at": "2019-08-24T14:15:22.123Z",
    "payload": {
        "channelId": "550e8400-e29b-41d4-a716-446655440000",
        "rawBase64": "RnJvbTogSm9obiA8am9obkBleGFtcGxlLmNvbT4uLi4=",
        "uid": "12345",
        "messageId": "<abc@mailer.example>",
        "gatewayMessageId": "gw-email-123",
        "receivedAt": "2026-03-05T10:00:00.000Z",
        "skipAgentAssignment": false
    }
}