Email Security

Most people set up DMARC and never look at the RUA reports. The XML is dense. Here's how to read it and use the data to tighten your policy.

TLS-RPT tells you when TLS negotiation fails between mail servers on your domain. Most organizations have never enabled it. Here's what you're missing.

SPF, DKIM, and DMARC are the three core email authentication standards. Understanding how they work together is essential for business email.

DMARC is the DNS policy layer that ties SPF and DKIM together. A short introduction to the record format, policy modes, and what publishing one actually does.