curl --request POST \
  --url https://www.dench.com/api/v1/email/sending-identities/{identity}/restore \
  --header 'Authorization: Bearer <token>'

{
  "ok": true,
  "restored": [
    {
      "identityId": "esi_abc123",
      "fromEmail": "founder@example.com",
      "disabled": false
    }
  ]
}