curl --request POST \
  --url https://app.spotzee.com/api/ext/generic/email/domain-blacklist-check \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data domain=example.com

{
  "status": "success",
  "data": {
    "domain": "example.com",
    "results": {
      "listed": 0,
      "unlisted": 17,
      "errors": 0
    },
    "check_results": [
      {
        "rbl": "Spamhaus DBL",
        "status": "Unlisted"
      }
    ]
  }
}