# E17009 — DomainNotInboundEnabled

This domain is not enabled for receiving email, so it cannot host a mailbox.

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

## What to do

Enable receiving on the domain and verify its receiving DNS records, or create the mailbox on the shared inbox.ai domain instead.

Operations that resolve this:

- [Get a sending domain](/docs/api/reference/get-domain)
- [Trigger domain verification](/docs/api/reference/verify-domain)

## Related

- [E17xxx — Agent mailboxes](/docs/api/errors/E17xxx): 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`