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Free email deliverability tools

Check what a receiving server sees when your domain sends mail. No signup, and every result has a link you can share.

  • SPF record checker

    Fetches a domain’s SPF record, follows every include and redirect, and counts DNS lookups and void lookups the way a receiving server does, showing which include costs the most.

  • DMARC record checker

    Looks up a domain’s DMARC record, falls back to the parent domain the way receivers do, and reports the policy that applies, the reporting address and what to change.

  • Email domain health check

    Checks SPF, DKIM, DMARC, BIMI, MX and forward-confirmed reverse DNS for a sending domain in one pass and explains each problem with a link to the fix.

  • SMTP bounce code reference

    A searchable reference of SMTP reply codes and enhanced status codes, with whether each is a hard or soft bounce, what to do about it, and the RFC or provider page it comes from.