# E04009 — OnboardingRecipientNotAllowed

Sends from the shared onboarding domain can only go to verified members of your workspace. To send to any recipient, add and verify a custom sending domain.

- **HTTP status**: `422`
- **Type**: `validation_error`
- **Name**: `OnboardingRecipientNotAllowed`

## What to do

Add and verify a custom sending domain to send to any recipient, then retry.

Operations that resolve this:

- [List sending domains](/docs/api/reference/list-domains)
- [Add a sending domain](/docs/api/reference/create-domain)
- [Trigger domain verification](/docs/api/reference/verify-domain)

## Related

- [E04xxx — Email sending & delivery](/docs/api/errors/E04xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`