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SPF
Explore sender policy
See published SPF records and inspect their dependencies.
EMAIL AUTHENTICATION DIAGNOSTICS
Know what your domain is telling the world.
Check SPF, DMARC, DKIM and mail routing in one place. See the records, understand the issues, and know what to fix.
◇ Public DNS only · No sign-up · No email access
◈ DOMAIN OVERVIEWILLUSTRATIVE EXAMPLE
example.com ↗
A clearer view of your email configuration.
⌁SPFSender authorizationRECORD FOUND
◎DMARCDomain policyREVIEW POLICY
⌘DKIMSigning keySELECTOR NEEDED
↗MXMail routingRECORD FOUND
◈ Evidence first. Decisions in your hands.
THE SIGNAL, WITHOUT THE NOISE
One domain. A clearer picture.
Understand the public records that help receiving servers handle your email.
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DMARC
Understand your policy
Review published policy and the context behind it.
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DKIM
Check a known selector
Inspect the public key your email provider publishes.
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MX
See where mail goes
Review mail routing, including intentional Null MX.
HOW IT WORKS
From DNS records
to next steps.
Built for domain owners, administrators and anyone who wants to understand their email setup.
Explore the guide ↗01
Enter a domain
Start with the domain you want to understand.
02
We read public DNS
MailTrust checks published records, without accessing your mail.
03
Review the evidence
See what was found, what needs attention and what remains unknown.
FREQUENTLY ASKED
Good questions, clear answers.
Does a published record prove my mail is secure?
No. DNS shows published configuration, not the authentication or delivery outcome of individual messages.
Where do I find a DKIM selector?
Look in your email provider’s DKIM setup or the s= value in a legitimate message’s DKIM-Signature header. You do not need to share the message.
Is a DMARC monitoring policy invalid?
No. A p=none policy is a valid way to request monitoring and collect information before considering enforcement.
A clear boundary. MailTrust checks published DNS configuration. It does not verify that actual mail is authenticated or delivered.