Secure Email Gateways Are
Not Built for the Cloud
Originally built to secure on-prem email, providers have attempted to adapt secure email gateways to the cloud. However, they suffer from many shortcomings due to their non-native design. The largest deficiency is their impediment to existing security. Their required changes to MX records impairs or completely erases the embedded filters, meaning that instead of adding security scans they completely replace the default, obfuscating the value from those inherent layers.