# E17042 — MessageSourceExpired

The original rendered source of this message has expired. The message's extracted text remains available for the mailbox's retention period.

- **HTTP status**: `410`
- **Type**: `gone_error`
- **Name**: `MessageSourceExpired`

## What to do

The resource existed but has been permanently removed. Stop requesting this resource; it will not return. Remove stored references to it.

## Related

- [E17xxx — Agent mailboxes](/docs/api/errors/E17xxx): 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`