Unregister an inbox
Unregisters (deletes) a previously registered inbox from your account. All messages stored in the inbox are permanently deleted along with it.
**Path parameters:**
- `:inbox` — URL-encoded inbox address (e.g., `test%40domain.com`)
**Behaviour:**
- Returns `204 No Content` on success — no response body.
- Returns `404` if the inbox does not exist or does not belong to your account.
- All messages within the inbox are deleted immediately and irreversibly.
**Plan:** All plans (Free and above).