# Know when a mailbox email was delivered or bounced
URL: https://samva.dev/changelog/know-when-a-mailbox-email-was-delivered-or-bounced
> Mailboxes publish a delivered or failed event for each recipient of an email they send, on webhooks and the event stream, typed in the SDK.
- Published: 2026-10-22
- Tags: api, sdk



A mailbox that sends email can now tell your code what happened to it. For each recipient, a `mailbox.message.delivered` event fires when their mail server accepts the message, and `mailbox.message.failed` fires when it bounces.

**What you need to do.** Nothing to keep working. To react, subscribe a webhook to `mailbox.*` or read the event stream. Match on `messageId` and `actionId`, since statuses can arrive before or after `mailbox.message.sent`.

In samva 0.25, `MailboxEventType` includes these events, so a `switch` over it sees them.

## Links

- [Mailbox events](/docs/mailboxes/events)
- [samva 0.25.0 on npm](https://www.npmjs.com/package/samva/v/0.25.0)

## Related

- [Edit a template's sending defaults in the dashboard](/changelog/edit-a-templates-sending-defaults-in-the-dashboard)
- [See sending credits and AI credits as two balances](/changelog/see-sending-credits-and-ai-credits-as-two-balances)
- [All changelog entries](/changelog)