You can configure the FortiGate unit to manage unsolicited commercial email by detecting and identifying spam messages from known or suspected spam servers.
The FortiGuard Anti-Spam service uses both a sender IP reputation database and a spam signature database, along with sophisticated spam filtering tools, to detect and block a wide range of spam messages. Using FortiGuard Anti-Spam profile settings, you can opt to filter with IP address checking, URL checking, email checksum checking, detection of phishing URLs in email, and spam submission. Updates to the IP reputation and spam signature databases are provided continuously via the global FortiGuard Distribution Network.
From the FortiGuard Anti-Spam service page in the FortiGuard Center, you can find out whether an IP address is blacklisted in the FortiGuard Anti-Spam IP reputation database, or whether a URL or email address is in the signature database.