Authentication
Authentication is only required for our Pro plan.
Our Free plan does not require authenticated requests.
We offer 2 ways to authenticate your requests, but we recommend using the Bearer token when possible.

Bearer token

Add the Authorization header to the request:
Authorization: Bearer YOUR-API-KEY

Query Parameter

Add the "key" query parameter to the URL:
https://api.mailcheck.ai/domain/example.com?key=YOUR-API-KEY