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SPF, DKIM & DMARC Checker

Check the SPF, DKIM and DMARC records of a domain online. Count SPF DNS lookups, validate syntax, see DKIM key sizes and DMARC policies, and build new SPF and DMARC records.

Browser → external provider

DomainDKIM selectors (optional)

Also try common DKIM selectors

Build records

Copy a record into a new TXT record at your DNS host. Changes can take up to the record's TTL to appear.

SPF

Servers in the A record of the domainServers in the MX records

Services that send for you (include:, one per line) Server IP addresses or networks (one per line) Mail from other servers

SPF record

DMARC

PolicySubdomain policyApply to (%)

Aggregate report mailboxes (rua, comma-separated)Failure report mailboxes (ruf, optional)

DKIM alignmentSPF alignmentFailure reports when

DMARC record

Ready when you are.

QUICK GUIDE

How to use this tool

Enter a domain and check it. SPF includes are followed to count the limit of 10 DNS lookups. DKIM keys can only be found by selector: take yours from the DKIM-Signature header (s=) of a message you sent. The builders create TXT records to add at your DNS host.

DNS queries go directly from your browser to Google Public DNS. Records you build stay in your browser.

Keep your workflow moving

Need another step? Try a related tool.