---
title: "Message Opened"
method: POST
path: "webhooks_events_messageOpened"
---

# Message Opened

`POST webhooks_events_messageOpened` (webhook)

## Headers

- `svix-id` string, required: ID of webhook message.
- `svix-signature` string, required: Signature of webhook message.
- `svix-timestamp` string, date-time, required: Timestamp of webhook message.

## Payload

- EventsMessageOpenedEvent: A tracked message was opened for the first time. Sent once per message: repeat opens do not resend it.
  - `type` 'event', required
  - `event_type` 'message.opened', required
  - `event_id` string, required: ID of the event. It is the same on every retry and redelivery of the event and on every webhook or WebSocket subscription that receives it, so use it to deduplicate. The format varies by event type; treat it as an opaque string.
  - `open` EventsOpen, required
    - `inbox_id` string, required: The ID of the inbox.
    - `thread_id` string, required: ID of thread.
    - `message_id` string, required: ID of message.
    - `timestamp` string, date-time, required: Timestamp of event.

## Acknowledgement `200`

Webhook received successfully

---

[API](https://skmtc.dev/agentmail-to/apis/api.md) - [All operations](https://skmtc.dev/agentmail-to/apis/api/llms.txt) - [OpenAPI document](https://skmtc.dev/agentmail-to/apis/api/revisions/a9792efe7bdf?raw)