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1 min read
Updated 2025-10-23
Tutorials
postfixmta-ststlsrptsmtp
Overview: Enforce TLS for SMTP with MTA-STS and collect TLS reports (TLSRPT) for insight.
Prerequisites: HTTPS hosting for policy, DNS control, Postfix config access.
Steps
- Host policy at
https://mta-sts.yourdomain/.well-known/mta-sts.txtwithmode=enforce. - Publish DNS:
_mta-sts TXTand_smtp._tls TXTfor TLSRPT. - Verify TLS: ensure server presents valid certificate and supports modern ciphers.
Verification
- MTA-STS: MTA-STS Lookup
- HTTPS: HTTPS Test
Troubleshooting
- Policy cache: mailbox providers cache; allow time after updates.
- Certificate errors: renew or fix intermediate chain.
FAQ
Q: Does MTA-STS affect DMARC? A: No; it governs SMTP TLS, complementary to DMARC.