You can ship a perfect newsletter and still have it land in spam if your DNS lies about who you are. SPF, DKIM, and DMARC are the three records every domain owner must get right.
What it does
Queries DNS-over-HTTPS for SPF, DKIM, DMARC, CAA, MX, TXT. Validates record syntax, flags weak DMARC policies (none/quarantine), missing alignment.
How to use it
- Open /tools/dns-email-audit/ in your browser.
- Enter the URL or domain you want to audit (or paste the inputs the tool requests for that specific check).
- Run the audit and review the per-check results inline.
- Copy the AI fix prompt from the bottom of the results and paste it into Claude / ChatGPT / Codex — the tool generates a domain-aware prompt that names every issue found.
- Apply the fixes to your source tree and re-run to confirm.
Why this exists
Most professional tools in this category cost $99 to $499 per month, lock results behind logins, or run on slow Chrome backends. The jwatte.com tool suite is built on three principles:
- Free + ungated — no signup, no quota
- Transparent — every check explains what it measures and how
- AI-augmented — every output produces a prompt that turns the audit into a fix in one paste
Companion tools
This tool pairs with the rest of the jwatte.com tools hub. For audits at scale, queue it inside Mega Batch. For deep single-page review, run it alongside Mega Analyzer.
Reference
- /tools/dns-email-audit/ — live tool
- /tools/ — full tool hub (60+ free tools)
- /about/ — about the author + the framework behind these tools