- Cisco Secure Email Threat Defense
Best for: Cisco shops wanting Talos-backed filtering
It is on the list as a Microsoft 365 product that can grow with you: you start in API mode and add the inline gateway later, from the same console. That suits a team that already runs Cisco security. Check fit first if you run Google Workspace or your own mail servers, because the product is built for Microsoft 365.
From Best Email Security Solutions for Business, Fall 2026
- Mimecast Advanced Email Security
Best for: Companies wanting a full gateway with clear tracking
It earns its place because you can run it as a gateway or through an API, and archiving and continuity sit in the same platform, which suits a company with a mixed mail setup. Social graphing and computer vision aim at impersonation, not only malware. Weigh whether you need the archive and continuity parts, since they change how much of your mail flow depends on one vendor.
From Best Email Security Solutions for Business, Fall 2026
