Looking up MTA-STS DNS record, fetching policy file, and checking TLS-RPT...
Looking up MTA-STS DNS record, fetching policy file, and checking TLS-RPT...
MTA-STS + TLS-RPT for
Checked 5/14/2026, 10:53:03 PM · 165ms
No MTA-STS at all. Mail in transit is not enforced.
Or share this URL with the team that owns the records.
looked up: _mta-sts.udemy.com
https://mta-sts.udemy.com/.well-known/mta-sts.txt
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I learned exactly what I needed to know in the real world. It helped me sell myself to <b>get a new role.</b></p></span></div></div><div class="learning-testimonial-card_source-small__jBKeN"><div class="learning-testimonial-card_source-avatar__1n_8I"><img src="https://cms-images.udemycdn.com/96883mtakkm8/6dT7xusLHYoOUizXeVqgUk/4317f63fe25b2e07ad8c70cda641014b/William_A_Wachlin.jpeg" alt="" class="ud-avatar ud-avatar-image" width="48" height="48" style="width:4.8rem;height:4.8rem" loading="eager"/></div><div class="learning-testimonial-card_source-details__Hg7l1"><div class="learning-testimonial-card_source-name__sxDkr" data-purpose="source-name">William A. 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I was not aware of this Google tool, but immediately after taking the course, I put it to use. 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Without it, you do not learn when receivers fail to enforce STS against your domain.
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The id is an opaque string. Bump it whenever you change the policy file, otherwise receivers will keep using the cached version.
_mta-stsv=STSv1; id=20260514225303TLS-RPT lets receivers send you JSON reports when STS / DANE fails. Point the rua at a mailbox you actually monitor.
_smtp._tlsv=TLSRPTv1; rua=mailto:[email protected]Host the file below at https://mta-sts.udemy.com/.well-known/mta-sts.txt with a trusted TLS cert (no self-signed). Replace the mx: line(s) with each of your real mail servers. Start with mode: testing to collect TLS-RPT failure reports before raising to mode: enforce.
version: STSv1 mode: testing mx: mail.udemy.com max_age: 86400
Cloudflare Workers, Pages, or any static host with HTTPS can serve this. The well-known path needs a Content-Type of text/plain.
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