MTA-STS Policy Generator
Fill in your MX hostnames and enforcement mode. We'll output both the DNS TXT record and the policy file you need to host at mta-sts.<your-domain>/.well-known/mta-sts.txt.
Want ongoing monitoring?
This tool is a one-shot check. PhishFence watches your domain with automated hourly monitoring (daily on Free) for DMARC changes, new lookalike registrations, and spoofing attempts.