> 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.

# Method not allowed

Returned as `application/problem+json` with `code` `method_not_allowed` and HTTP status `405`.

The endpoint exists but does not support the HTTP method you used.

## Common causes

* e.g. `POST` to a read-only resource, or `DELETE` where it is not supported.

## How to resolve

* Check the [API Reference](/api/api-reference) for the methods each endpoint allows.

## Example

```json
{
  "type": "https://docs.usglobalmail.com/api/problems/method_not_allowed",
  "title": "The HTTP method is not allowed here.",
  "status": 405,
  "code": "method_not_allowed",
  "request_id": "req_8f3c2a1b9d",
  "instance": "/v1/mails"
}
```

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