Transport Layer Security Reporting
SMTP TLS Reporting (TLS-RPT) is an email security standard that provides visibility into transport layer security issues encountered while delivering email. Receiving mail systems generate reports that describe TLS-related delivery problems, helping domain owners understand whether secure email delivery is functioning as expected.
While authentication standards such as SPF, DKIM and DMARC focus on validating the sender, TLS-RPT focuses on the security of the connection between mail servers. It helps organizations understand whether email can be delivered securely and whether encryption-related problems are affecting communication.
Problems that occur during encrypted SMTP delivery are often invisible to administrators. Messages may continue to flow while underlying transport security issues remain unnoticed for weeks or even months.
Failed certificate validation, TLS negotiation errors and policy mismatches can reduce the effectiveness of email transport security without generating obvious alerts. As organizations increasingly rely on secure email delivery, visibility into these failures becomes an important part of maintaining a healthy email security posture.
TLS reports are generated by external mail providers and contain technical information about delivery attempts and transport security failures. These reports may include information about certificate validation issues, MTA-STS policy violations, TLS negotiation failures and other conditions that affect secure email transport.
Although the reports themselves are primarily designed for automated processing, they provide valuable insight into how other organizations experience your email infrastructure. This external perspective can help identify issues that might otherwise remain hidden from internal monitoring systems.
TLS reports contain valuable operational data, but interpreting the raw reports can be difficult. MailReport collects, processes and visualises TLS reports in an easy-to-understand format, turning complex technical feedback into actionable insight.
This helps organizations identify transport security issues, validate MTA-STS deployments and monitor changes in how external providers interact with their email infrastructure. This allows you to:
By making transport security visible, MailReport helps organizations verify that secure email delivery is not only configured, but also functioning correctly in the real world.