# E05021 — InboundMessageNotFound

The requested received email message was not found.

- **HTTP status**: `404`
- **Type**: `not_found_error`
- **Name**: `InboundMessageNotFound`

## What to do

List received messages to find a valid message ID, then retry.

Operations that resolve this:

- [List received emails](/docs/api/reference/list-inbound-messages)

## Related

- [Regions](/docs/api/regions): matching keys, hosts, and data location
- [E05xxx — Domains & DNS](/docs/api/errors/E05xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`