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Email Authentication Checker

Check public SPF, DKIM, DMARC and MX records for your domain. This is a DNS snapshot, not an inbox-placement test. Missing results may reflect an uncommon DKIM selector or a lookup failure.

The three records that decide if your mail is trusted

  • SPF — a DNS record listing which mail servers are allowed to send as your domain. Missing it, and anyone can spoof you.
  • DKIM — a cryptographic signature on every message proving it wasn't tampered with in transit.
  • DMARC — tells receivers what to do with mail that fails SPF/DKIM, and emails you reports of forgery attempts.

Get all three right and Gmail, Outlook and Yahoo trust your mail. Miss one and a slice of your invoices, quotes and replies quietly go to spam — and you never find out why. Read the full guide: SPF, DKIM, DMARC explained.

Common questions

Does this test inbox placement?
No. This tool reads public DNS records. It does not send a message, verify a live DKIM signature, evaluate every SPF lookup, or test sender reputation and recipient filtering.
What if DKIM is not detected?
DKIM uses a provider-specific selector. This tool probes common selectors, including Modusdom, but cannot enumerate every possible key. Check the selector in your provider settings or a signed message header.
Do missing records explain every spam problem?
No. Authentication is one factor. Message content, sender reputation, recipient policies and DNS lookup failures can also affect results. Use the DNS findings as a starting point, then inspect an actual message or bounce.
Can you help with the findings?
Yes. Compare the scope of our email setup services and share your domain, provider and symptoms. Confirm access and the intended changes before any DNS work.

Mail landing in spam? We'll fix the plumbing.

Set up business email with us and we configure SPF, DKIM and DMARC for you — correctly, verified, before you send a thing. Authentication helps receivers verify messages; inbox placement is not guaranteed.

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