curl --request POST \
  --url https://api.railmail.app/api/v1/sending-domain/verify-dns \
  --header 'X-API-Key: <api-key>'

{
  "domainId": 123,
  "resultingStatus": "<string>",
  "healthScore": 123,
  "records": [
    {
      "id": 123,
      "recordType": "<string>",
      "host": "<string>",
      "expectedValue": "<string>",
      "actualValue": "<string>",
      "status": "<string>",
      "lastCheckedAt": "2023-11-07T05:31:56Z",
      "failureReason": "<string>"
    }
  ],
  "allVerified": true
}