Email filter

Email filters can be configured to perform spam detection and filtering. You can customize the default profile, or create your own and apply it to a firewall policy.

Note

Two kinds of filtering can be defined in a single profile, and they will act independent of one another.

Filter options can be organized according to the source of the decision:

  • Local options: the FortiGate qualifies the email based on local conditions, such as block/allowlists, banned words, or DNS checks using FortiGuard Antispam.
  • FortiGuard-based options: the FortiGate qualifies the email based on the score or verdict returned from FortiGuard Antispam.
  • Third-party options: the FortiGate qualifies the email based on information from a third-party source (like an ORB list).

Local and FortiGuard block/allowlists can be enabled and combined in a single profile. When combined, the local block/allowlist has a higher priority than the FortiGuard block list during a decision making process. For example, if a client IP address is blocklisted in the FortiGuard server, but you want to override this decision and