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Tools / Domain check · free · no account

What does your domain tell mailbox providers?

Free SPF, DKIM, DMARC, MX, and blocklist check for any sending domain. Results describe authentication and reputation signals only — never a placement prediction.

Only if you know it, such as k2 or google. Without one, the check tries common selectors.

If you know the address your mail actually leaves from, we will check it against the same blocklists. Your platform shows it in its sending or SMTP settings, and it appears in the `Received:` header of any message you have sent. The domain answer above does not need it. We do not store the address you enter. Checking it means sending it, as a DNS query, to the operators of the blocklists named below.

Lists checked: Barracuda, SpamCop, PSBL Surriel.

What it can see

Records published in public DNS for SPF, DKIM, DMARC and MX, and whether the addresses your SPF record authorises appear on the blocklists we query.

What it can't

How your sending platform uses these records, your reputation at mailbox providers, or where your mail ends up.