DNS lookup tools work by querying the Domain Name System to retrieve information about a specific domain. Here's a brief overview of the process:
1. Querying DNS Servers: The tool sends a query to DNS servers to get the corresponding IP address for the domain. 2. Fetching Records: It fetches various DNS records such as A, MX, SPF, DKIM, and DMARC records. 3. Validation: The tool then validates these records to ensure that they are correctly configured for email delivery.