SPF Record Checker

How it works

SPF lists the servers allowed to send mail for your domain. Receivers evaluate it on every message; a PermError counts as a failure and hurts DMARC alignment.

Each include, a, mx, ptr, exists and redirect costs one DNS lookup, and includes are followed recursively. We walk the whole tree, so the count you see is what receivers see.

Common problems we flag: more than one SPF record, +all (anyone may send as you), ?all (no protection), the deprecated ptr mechanism, and includes pointing at domains with no SPF.

Automate it with the API

Run this check for every address in your product, from any language.

curl -X POST "https://www.mailrambo.com/v1/verify?detail=full" \
  -H "Authorization: Bearer $MAILRAMBO_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email": "jane@acme.com"}'
# -> detail.dns: { spf, dmarc_policy, dkim_selectors, bimi, ptr, mx_hosts }

API reference · Get a free API key

Frequently asked questions