Stop attackers from spoofing your domain. These tools grade your email authentication and help you build correct SPF and DMARC records. They query public DNS resolvers for the domain you enter to read its records. Nothing you enter is stored.
Check where your domain stands today, then generate the records to close the gaps.
Grade a domain's email authentication from A to F, with plain-English explanations and fixes for every gap.
Validate an SPF or DMARC record for errors and weaknesses, or generate a correct one with DNS instructions.