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strictmx mail health audit · €179 · 48h

Check your domain

SPF, DMARC, MTA-STS, DNSSEC, DANE and the TLS your mail servers actually present. Free, and it takes about twenty seconds.

The result opens at its own link, and that link is emailed to you so you can come back to it. Kept for 30 days, then deleted. I may write once when the monitoring product exists; every message has an unsubscribe link.

What this does not do

This reads public DNS and talks to your mail servers the way any sender would. It cannot see the headers of a message that was actually rejected, and those are what say which of your problems is the one costing you delivery. That is what the audit is for.