- Abnormal Inbound Email Security
Best for: Microsoft 365 or Google teams fighting BEC
It belongs here as the API option, because it judges each message against normal behavior and needs no rules to maintain. That suits you if vendor and payment fraud worry you more than mass malware. Since it does not sit in the mail path, decide whether you pair it with a gateway or with the filtering your mail platform already has.
From Best Email Security Solutions for Business, Fall 2026
- Broadcom Symantec Email Security
Best for: Large companies needing cloud and on-premises mail
It makes the list because it offers both a cloud service and an on-premises Messaging Gateway, as a virtual or physical appliance, which suits large companies that still run their own mail servers. Browser isolation opens risky links away from the user's machine. If you plan to move mail to the cloud, ask how your policies carry over from the gateway to the cloud service.
From Best Email Security Solutions for Business, Fall 2026
