> 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.

# Internal error

Returned as `application/problem+json` with `code` `internal_error` and HTTP status `500`.

Something failed unexpectedly on our side. The failure is logged against your `request_id`.

## Common causes

* An unhandled server error.

## How to resolve

* Retry with exponential backoff.
* If it persists, contact support and quote the `request_id`.

## Example

```json
{
  "type": "https://docs.usglobalmail.com/api/problems/internal_error",
  "title": "An unexpected error occurred.",
  "status": 500,
  "code": "internal_error",
  "request_id": "req_8f3c2a1b9d",
  "instance": "/v1/mails"
}
```

> **Note**
>
> This error is typically transient — safe to retry with exponential backoff.