# email_domain_invalid

HTTP 400 · Sender domains (SPEC §9.1)

That isn't a domain you can send from. Use a domain or subdomain you control, such as example.com or mail.example.com.

## Does retrying help?

Not as it is. Change the request as the message says, then send it again.

## The response

Every Flatstack error has this shape. `details`, when present, says more about this case.

```json
{
  "error": {
    "code": "email_domain_invalid",
    "message": "That isn't a domain you can send from. Use a domain or subdomain you control, such as example.com or mail.example.com.",
    "docsUrl": "https://flatstack.dev/docs/errors/email_domain_invalid"
  }
}
```

[All error codes](/docs/errors)