Free email deliverability tools
Check the DNS records that decide whether your cold email lands. Every tool runs live in your browser over DNS-over-HTTPS, with no signup and nothing stored.
- MX Record LookupLook up a domain's MX records (the mail servers that receive its email), in priority order.
- DNS LookupLook up any DNS record (A, AAAA, MX, TXT, CNAME, NS) for a domain, live.
- SPF Record CheckerFind and validate a domain's SPF record: syntax, the 10-lookup limit, and the all qualifier.
- DKIM Record CheckerLook up a domain's DKIM public key at a given selector and confirm it is published.
- DMARC Record CheckerFind and parse a domain's DMARC record: policy, reporting address, and alignment.
- Email Signature GeneratorBuild a clean, lightweight HTML email signature and copy it in one click.
Records check out? You are still not done.
Correct SPF, DKIM, and DMARC get you authenticated, but inbox placement also needs sender reputation and domain warmup. Scheduler Zero handles both so your cold email actually lands.