curl --request POST \
  --url https://prod.featherhq.com/api/v1/email-domains \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "subdomain": "<string>",
  "domain": "<string>"
}
'

{
  "emailDomain": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "organizationId": "<string>",
    "subdomain": "<string>",
    "domain": "<string>",
    "fullDomain": "<string>",
    "providerDomainId": "<string>",
    "mxRecord": "<string>",
    "mxPriority": 123,
    "spfHostname": "<string>",
    "spfValue": "<string>",
    "dkimSelector": "<string>",
    "dkimHostname": "<string>",
    "dkimValue": "<string>",
    "cnameValue": "<string>",
    "cnamePriority": 123,
    "mxVerified": true,
    "spfVerified": true,
    "dkimVerified": true,
    "cnameVerified": true,
    "verifiedAt": "<string>",
    "lastCheckedAt": "<string>",
    "createdAt": "<string>",
    "updatedAt": "<string>"
  }
}