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SPF Checker

Check your SPF record.

Look up a domain's SPF record, validate it, and count the DNS lookups it uses.

What is an SPF record?

SPF (Sender Policy Framework) is a DNS TXT record that lists which mail servers are allowed to send email for your domain. Receiving servers check the sending IP against this list to help detect spoofing and improve deliverability.

A valid record starts with v=spf1 and ends with an all mechanism — usually -all (hard fail) or ~all (soft fail). Keep the total number of DNS-querying mechanisms at 10 or fewer, otherwise mail can fail SPF with a permerror. Need to build one? Try the SPF Generator.

More free tools

SPF Generator

Build a valid SPF record from your mail sources.

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Find the mail servers that accept mail for a domain.

DKIM Checker

Retrieve and inspect a DKIM public key by selector.

DMARC Lookup

Check a domain's DMARC policy and reporting setup.

IP Lookup

Resolve an IP or hostname and geolocate it.

WHOIS Lookup

Query registration details for a domain or IP.

NS Lookup

List nameservers and query DNS records for a domain.

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