Detect a domain's registrar

Looks up the domain's nameservers to detect its DNS registrar and returns the provider, nameservers, and a link to its setup docs.

curl -X POST "https://example.com/v1/email/domains/string/registrar" \  -H "Content-Type: application/json" \  -d '{    "domain": "string"  }'

{  "provider": "string",  "name": "string",  "nameservers": [    "string"  ],  "docsUrl": "string"}