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Tools

MTA-STS checker.

Validate an MTA-STS setup end to end: the DNS record, the HTTPS policy file, and MX coverage.

We read the _mta-sts DNS record, fetch the HTTPS policy file, and check it covers your real MX hosts. The policy fetch is the only request that leaves our server.

This check is a snapshot. dmarcula watches your domain around the clock, reads the DMARC reports for you, and emails you when something changes. Free, no credit card.

Start monitoring free How it works