Free tool · Posture summary
Email-auth scorecard
One page. DMARC, SPF, DKIM, MTA-STS, vendor exposure, spoofability verdict, top issues. Designed to travel in Slack, Teams, and email - the kind of artifact you hand to your IT team or board. No signup.
What this tool checks
We resolve four signals from public DNS: DMARC policy and alignment, SPF qualifier strictness, DKIM key presence, and MTA-STS enforcement. We add a vendor exposure summary - how many third parties can send mail as your domain, who the top ones are, and whether any consolidation flags fire. That all collapses into a composite grade (A+ to F) and a spoofability verdict.
Output is a 1-page PDF. Sized for Letter or A4 paper. Watermarked with the public scorecard URL the recipient can revisit to verify or re-run. Sized small enough to attach to an email (typically 25-40 KB).
We don't store the scorecard. Re-running the same domain six months later will reflect whatever DNS looks like at that moment, not the cached PDF. The "as of" date on the artifact makes staleness obvious to any reader.
How to read the results
The grade: composite of two inputs:
- Spoofability verdict: yes / maybe / no. Derived from DMARC + SPF + DKIM + MTA-STS strictness. A "no" verdict means a sender impersonating your domain to a strict-DMARC receiver (Gmail, Yahoo, Microsoft 365) gets rejected.
- Vendor sender count: how many third parties are SPF / DKIM-authorized to send as your domain. Each one is an independent compromise path. A clean DMARC posture with 8 vendors authorized is a worse risk profile than a clean DMARC posture with 2 vendors authorized - reflected in the grade.
The top issues section pulls the most actionable recommendations from the spoofability check plus any consolidation flags. Truncated to 5 items so the page stays scannable.
Frequently asked questions
Why a PDF and not a web page?
Is the grade comparable to other tools (MXToolbox, dmarcian, EasyDMARC)?
Can I rebrand the scorecard for my MSP?
Does the scorecard expose any internal data?
How fresh is the data?
Related free tools
Spoofability checker
Yes / maybe / no verdict in HTML, with signal-by-signal breakdown.
Vendor consolidation report
Per-vendor blast radius. Pairs with the scorecard.
DMARC + SPF analyzer
Drill into the auth signals the scorecard summarizes.
De-authorization guides
If the scorecard flags vendor sprawl, here is how to remove the surface.