Verify your MTA-STS policy file and DNS records for SMTP security.
MTA-STS Validator ensures your domain is advertising a valid security policy that forces TLS for incoming mail.
Checks _mta-sts DNS TXT record
Attempts to fetch policy from the well-known HTTPS endpoint
Validates policy syntax and expiration
Confirms policy id, mode, and max_age correctness
Detects HTTPS endpoint and policy fetch failures
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