Use DNS Lookup Tools: Various online tools can help you look up your DNS records and verify their correctness. These tools can alert you to any misconfigurations. Check SPF Record: Ensure that your SPF record includes all the IP addresses that are authorized to send emails on behalf of your domain. Verify DKIM: Use tools to check that DKIM is correctly set up and that the keys are valid. Review DMARC: Make sure that your DMARC policies align with your email practices and are set to properly handle unauthenticated emails. Inspect MX Records: Confirm that your MX records point to the correct mail servers and are prioritized correctly.