MTA-STS Policy Check
Validate the complete DNS and HTTPS MTA-STS policy flow.
What DomainPulse checks
The signaling TXT record, HTTPS policy fetch, redirect behavior, certificate, syntax, mode, max_age and MX patterns.
Common problems
Missing policy file, invalid HTTPS, malformed fields and MX patterns that do not cover published servers.
FAQ
Is the TXT record enough?
No. The HTTPS policy must also be fetched and validated.
What does testing mode do?
It reports policy failures without requiring senders to block delivery.