I tried adding a domain to zeptomail.zoho.com, but the “add domain” operation failed. The front‑end error reads: “Domain could not be added. Please contact support@zeptomail.com.” The back‑end API returned:

```

{

  "error": {

    "code": "TM_3601",

    "details": [

      {

        "code": "DE_150",

        "message": "Antispam validation failed for your domain in Accounts."

      }

    ],

    "message": "Request Denied"

  }

}

```

The domain was originally added to another ZeptoMail account. I deleted it from that account and then attempted to add it to my current account, but the addition still fails.