curl --request GET \
  --url https://openapi.enginy.ai/v1/identities/{identityId}/mailboxes \
  --header 'x-api-key: <api-key>'

{
  "message": "<string>",
  "data": {
    "identityId": 123,
    "mailboxes": [
      {
        "id": 123,
        "identityId": 123,
        "email": "<string>",
        "isPrimary": true,
        "emailCredentialsExpired": true,
        "warmup": {
          "enabled": true,
          "mailboxId": 123
        }
      }
    ]
  }
}