Free email and DNS checks
Check the DNS records behind your email, see what is wrong in plain words and copy the exact record that fixes it. No account, no tracking, nothing to install.
Email deliverability checkSPF · DKIM · DMARC · MX · domain blocklists
Run the email deliverability check on your domain: SPF, DKIM, DMARC, MX, domain blocklists and more in one run, with the fixes in the order to do them.
Coming next: an inbox placement test
DNS checks show whether receivers can trust your mail, not where they put it. We are building a test where you send one message to addresses we give you and see whether it lands in the inbox or the spam folder of our own Gmail and Microsoft mailboxes, with a report on how it was authenticated. It is not ready yet; until then, the checks below are what this site does.
Tools
Domain checks
- Email Deliverability Check for Your DomainFree email domain checker: SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, BIMI and domain blocklists in one run, with a plain verdict and the exact fixes.
- MTA-STS CheckerCheck MTA-STS for any domain: the _mta-sts TXT record, the policy file over HTTPS, its mode and max_age, and whether every MX host is covered.
- BIMI CheckerCheck the BIMI setup of any domain: the default._bimi record, the DMARC policy BIMI needs, the SVG Tiny PS logo and the VMC or CMC certificate.
DNS lookups
- TXT Record LookupLook up the TXT records of any domain or subdomain. SPF, DMARC, DKIM and verification records are labeled in plain words, with TTLs and raw DNS answers.
- CNAME LookupLook up the CNAME record of any host name: see which name it is an alias for, its TTL, and whether it breaks DNS rules such as a CNAME at the apex.
Generators
- BIMI Record GeneratorCreate a BIMI record that points mailbox providers to your SVG logo and mark certificate, checked against the BIMI draft and what Gmail and Yahoo need.
- SPF Record GeneratorCreate an SPF record for your domain: pick the services that send your email, add your servers, and get one valid TXT record with its DNS lookups counted.
- DKIM GeneratorGenerate a DKIM key pair and the DNS record for it in your browser. RSA 2048 by default; the private key is created on your device and never sent to us.
- DMARC Record GeneratorBuild a DMARC record step by step: start in monitoring mode, get reports, then test and enforce. Follows RFC 9989, the current DMARC standard.
Email tests
- DMARC Report AnalyzerOpen a DMARC aggregate report (.xml, .xml.gz or .zip) and see who sends mail as your domain and whether it passes. Read in your browser, never uploaded.
- SMTP TestFree SMTP tester: we connect to your mail server on port 25, 587 or 465 and check the greeting, EHLO, STARTTLS and certificate. No email is sent.
How we work
- Every check result shows the raw answers it is based on, from DNS and, where a check uses them, from mail and web servers, so you can verify it yourself.
- When we cannot check something (a DNS server does not answer, a lookup times out), we say so. We never turn a gap into a pass or a fail.
- No registration, no tracking pixels, no cookies, no ads.