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Checker

Email domain check

Check a domain all at once (spam check for domains): SPF, DKIM, DMARC, MX, STARTTLS, MTA-STS and domain blocklists, without a test email and without signing up.

What the domain check covers

  • MX and STARTTLS: which servers accept email, whether they encrypt and whether the certificate is valid.
  • SPF, DKIM and DMARC: whether the domain proves its senders and what happens to forged emails. We look for DKIM with the common selectors.
  • MTA-STS: whether the domain enforces encrypted delivery.
  • Domain blocklists: whether the domain is on important lists.

The check reads public DNS data only. Whether a specific email lands in spam is shown by the email test on the home page.

FAQ

What does the domain check cover?

Enter your domain. We check the MX records, the encryption of the mail servers, SPF, DKIM (with the common selectors), DMARC, MTA-STS and the domain blocklists, all from public DNS data.

Do I need a test email for this?

No. The domain check only reads what your domain publishes in DNS. Whether a specific email lands in spam is shown only by the email test with a real email.

Why does the check not find my DKIM key?

We try the common selectors of the large providers. If your sending service uses its own selector, enter it in the DKIM checker. You will find it in the header of a sent email.