free tool
SPF & DMARC checker
SPF lists who may send for a domain; DMARC tells receivers what to do when a message fails. Together they say a lot about how seriously a domain treats email.
try
faq
SPF & DMARC checker: common questions
What DMARC policy should a business use?
Start with p=none to collect reports, then move to quarantine and finally reject once legitimate senders pass.
Does SPF prove a domain is a business?
Not on its own, but includes for business SaaS and a strict DMARC policy are strong signals we use in scoring.
Is the record cached?
Results may be cached for a short time to protect DNS resolvers; changes you make appear within minutes.