> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.usglobalmail.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.usglobalmail.com/_mcp/server.

# Not found

Returned as `application/problem+json` with `code` `not_found` and HTTP status `404`.

The resource does not exist, or is not visible to this key. A resource owned by another account also returns 404 (not 403), so ids can't be probed.

## Common causes

* The id is wrong or refers to a deleted resource.
* The resource belongs to another account.
* The URL path is incorrect.

## How to resolve

* Verify the id and the path.
* List the collection to find valid ids.

## Example

```json
{
  "type": "https://docs.usglobalmail.com/api/problems/not_found",
  "title": "The requested resource was not found.",
  "status": 404,
  "code": "not_found",
  "request_id": "req_8f3c2a1b9d",
  "instance": "/v1/mails"
}
```

> **Note**
>
> Retrying without changing the request will not help — fix the request first.