Email remains the primary communication channel for most organizations, but it was never designed with modern security requirements in mind. While protocols such as SPF, DKIM, and DMARC help verify sender identity, they do not protect emails while they are traveling between mail servers. This is where MTA-STS (Mail Transfer Agent Strict Transport Security) plays a crucial role.

As Cisco grew into the dominant email security vendor, A saying became loud into this space: "Nobody ever got fired for buying Cisco." The idea was that choosing the market leader was the safest decision because it was easy to justify if things went wrong. In today's email cybersecurity, however, that mindset can be dangerous.