Nylas message.transactional.bounced notification object

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/nylas/refs/heads/main/json-schema/nylas-message-transactional-bounced.schema.json",
  "title": "Nylas message.transactional.bounced notification object",
  "description": "Sent when a transactional email was not delivered due to a hard bounce. This schema describes `data.object` inside the Nylas notification envelope.",
  "type": "object",
  "properties": {
    "message": {
      "type": "object",
      "description": "The original transactional message that bounced.",
      "properties": {
        "id": {
          "type": "string",
          "description": "The Nylas message ID."
        },
        "subject": {
          "type": "string",
          "description": "The message subject line."
        },
        "from": {
          "type": "string",
          "description": "Sender email address."
        },
        "to": {
          "type": "array",
          "description": "Primary recipient email addresses.",
          "items": {
            "type": "string"
          }
        },
        "cc": {
          "type": "array",
          "description": "CC recipient email addresses. Omitted if none were specified.",
          "items": {
            "type": "string"
          }
        },
        "bcc": {
          "type": "array",
          "description": "BCC recipient email addresses. Omitted if none were specified.",
          "items": {
            "type": "string"
          }
        },
        "sent_at": {
          "type": "integer",
          "description": "Unix timestamp when the message was sent."
        },
        "metadata": {
          "type": "object",
          "description": "Custom key-value metadata attached when sending. Omitted if none were provided.",
          "additionalProperties": true
        }
      }
    },
    "bounce": {
      "type": "object",
      "description": "Bounce details.",
      "properties": {
        "bounced_at": {
          "type": "integer",
          "description": "Unix timestamp when the bounce occurred."
        },
        "type": {
          "type": "string",
          "description": "Bounce type (e.g. `MailboxFull`)."
        },
        "recipients": {
          "type": "array",
          "description": "Recipients that bounced.",
          "items": {
            "type": "object",
            "properties": {
              "email": {
                "type": "string",
                "description": "Email address that bounced."
              },
              "diagnostic_code": {
                "type": "string",
                "description": "SMTP diagnostic code from the receiving server."
              }
            },
            "required": [
              "email"
            ]
          }
        }
      }
    }
  },
  "required": [
    "message",
    "bounce"
  ],
  "x-nylas-trigger": "message.transactional.bounced",
  "x-nylas-category": "Transactional Email",
  "x-provenance": {
    "method": "authored",
    "publisher": "Nylas",
    "source": "https://developer.nylas.com/docs/reference/notifications/transactional-email/message-transactional-bounced/",
    "derived_from": "nylas/developer.nylas.com@a7995fb6:src/_component-data/notification-schemas.json",
    "generated": "2026-09-28"
  },
  "examples": [
    {
      "message": {
        "id": "<MESSAGE_ID>",
        "subject": "Your order has shipped",
        "from": "notifications@example.com",
        "to": [
          "jordan.taylor@example.com"
        ],
        "cc": [
          "sam.lee@example.com"
        ],
        "bcc": [
          "alex.johnson@example.com"
        ],
        "sent_at": 1234567890,
        "metadata": {
          "campaign": "welcome-email"
        }
      },
      "bounce": {
        "bounced_at": 1234567890,
        "type": "MailboxFull",
        "recipients": [
          {
            "email": "john@example.com"
          },
          {
            "email": "jane@example.com",
            "diagnostic_code": "smtp; 550 user unknown"
          }
        ]
      }
    }
  ]
}