MTA-STS & TLS-RPT on a Mac

Enforce SMTP TLS and get TLS failure reports (standard) · Email Deliverability & Reputation

MTA-STS tells sending servers to require valid TLS when delivering to your domain (via an _mta-sts TXT record plus a policy file served over HTTPS at mta-sts.), closing downgrade/MITM gaps; TLS-RPT (_smtp._tls TXT) collects daily reports of TLS negotiation failures so you can spot delivery problems. Publish the records, host the policy file, and feed TLS-RPT into a reporting tool. Pairs with the Mail Server pane.

Run MTA-STS & TLS-RPT with FrontierStack

Install or connect MTA-STS & TLS-RPT; then check its status, ports and certificate from FrontierStack. The same screen links to firewall checks, Malware Audit and backups where they apply.

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