# adapter_not_found (/docs/reference/errors/adapter-not-found)



`EmailAdapterNotFoundError` has code `adapter_not_found`, is not retryable, and exposes the missing `adapter` string.

Literal route names normally fail type checking. This error remains necessary for values that enter from untyped configuration, JSON, plugin code, or other runtime boundaries.

```ts title="src/send.ts"
if (error instanceof EmailAdapterNotFoundError) {
  console.error(error.adapter);
}
```

List registered routes through `email.adapters` or run `email-sdk adapters` for bundled CLI names.