Free tools / SPF and DMARC checker

Free SPF and DMARC checker

Check a domain's e-mail authentication records: whether SPF and DMARC are present, their policies, and the domain's MX, NS, A and TXT records.

The result appears here as JSON.

One free check per tool and IP address per day. Nothing is stored.

What you get

• SPF record and its policy; DMARC record, policy and reporting address
• MX, NS, A, AAAA, TXT and CNAME records

Not returned: DKIM selectors (they cannot be discovered without the selector name).

Use it from code or an agent

curl "https://api.ambolt.dev/v1/dns-lookup?domain=example.com&free=1"

Same tool as an MCP tool (dns_lookup, free at 30 requests a minute), as a pay-per-call endpoint ($0.003 a call in USDC) and as an Apify Actor. Reference · Docs

Questions

What do SPF and DMARC do?

SPF lists who may send mail for a domain; DMARC tells receivers what to do with mail that fails and where to send reports.

Is anything sent to the domain?

Only ordinary DNS lookups.

Why is DKIM missing?

DKIM keys live under a selector name that only the sender knows.