TLS-RPT (RFC 8460) enables domain owners to receive reports about failures in establishing TLS-secured SMTP connections to their mail servers. The Untangled Labs TLS-RPT Checker validates the _smtp._tls TXT record for any domain and checks that a valid reporting address (rua) is configured. Works alongside MTA-STS and DANE to complete your email delivery monitoring stack. Free, no account required.
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