MTA-STS Checker
Check MTA-STS policy for your domain to ensure encrypted email transport.
How to use the MTA-STS Checker
Check MTA-STS policy for your domain to ensure encrypted email transport. Enter the domain, hostname, IP address, selector, or record value requested by the tool, then run the check to see the current public configuration. Use the result to confirm whether the domain is resolving correctly, whether email authentication is aligned, or whether a visible trust issue needs follow-up.
Enter the domain or value you want to inspect.
Review the returned records, warnings, and status signals.
Fix the DNS, hosting, SSL, or email setting, then retest.
What to check next
A single lookup rarely tells the whole story. For production websites, verify DNS, SSL, email authentication, blacklist status, and public security headers together before making a launch, migration, or deliverability decision. Common next checks after this page include DMARC Checker, SPF Checker, DNS Checker.
MTA-STS Checker FAQ
What does the MTA-STS Checker check?
Check MTA-STS policy for your domain to ensure encrypted email transport.
Is the MTA-STS Checker free to use?
Yes. The basic mta-sts checker is free and does not require a login. Paid Hostao reports and fix plans are available when you need analyst review or managed remediation.
When should I run the MTA-STS Checker?
Run it before DNS changes, email sender changes, hosting migration, SSL renewal, launch checks, or whenever a website, domain, or email delivery issue needs quick verification.