Free diagnostic tools

Forensic email authentication tools.

Scan SPF, DKIM, and DMARC records on any domain. Understand what's broken and why before it kills your deliverability. Every tool is free and runs in seconds.

01 — SPF

SPF Checker

Pull the SPF record for any domain, parse every include and mechanism, and check whether you're burning through the 10 DNS lookup limit.

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02 — DMARC

DMARC Checker

Inspect the DMARC record at _dmarc.domain. See the policy, alignment, reporting addresses, and whether the domain is actually protected from spoofing.

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03 — DKIM

DKIM Selector Scanner

Discover DKIM selectors for known sending platforms (HubSpot, Mailchimp, SendGrid, and more) and verify public keys are published.

Coming soon
04 — STACK

Tech Stack vs. SPF Scan

Scan the website HTML for email-sending platforms, then cross-reference against the SPF record to find every gap. The forensic tool that nobody else has.

Coming soon