Free · runs in your browser
MTA-STS Checker
Verify MTA-STS policy publication.
How it works
MTA-STS Checker
Verify MTA-STS policy publication. Runs in your browser — you can email the result.
Results appear here after you click Check.
Ready to send from your product? MailShrine Developer API uses the same DNS, webhooks, and SMTP patterns this tool inspects.