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, 10:49:29 PM · 154ms
No MTA-STS at all. Mail in transit is not enforced.
looked up: _mta-sts.substack.com
Or share this URL with the team that owns the records.
https://mta-sts.substack.com/.well-known/mta-sts.txt
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<div path="/not-found" class="page typography signup-page"><div class="container"><h2>Not Found</h2><p>The page you are attempting to access is not found.</p><p>If you want to claim this URL you can start a Substack today</p><p><a href="https://substack.com/signup" rel="nofollow" class="button primary">Start a Substack</a></p><p><a href="https://substack.com/search/mtasts?searching=publication">Search Substack for "mtasts"</a></p></div></div>
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<!-No TLS-RPT record found. Without it, you do not learn when receivers fail to enforce STS against your domain.
for substack.com
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=20260514224929TLS-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.substack.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.substack.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.
AI-assisted remediation
Wiredepth Pro sends this report to our AI engine and streams back a 30-day rollout plan tailored to substack.com, with provider-specific tips when we can infer them from the data. 10 playbooks per month on Pro, 100 on MSP.