Enable Black IP to query for the blacklist status of the IP addresses of all SMTP servers appearing in the Received: lines of header lines. Caching can be enabled in Maintenance > FortiGuard > AntiSpam. If FortiGuard is enabled in a antispam profile, also enable caching and Enable Black IP to query for the blacklist status of the IP addresses of all SMTP servers appearing in the Received: lines of header lines.Sender reputation, session limiting, and error handling are particularly useful. Apply spam throttling features by creating an IP-based policy (located in Policy > Policies > Policies) with a session profile (located in Profile > Session > Session).Enable greylisting (located in Profile > AntiSpam > AntiSpam) to reject many spam delivery attempts before more resource-intensive antispam scans are used to identify spam.If quarantining is enabled and neither of these features are enabled, performance will suffer and could potentially cause the FortiMail unit to refuse SMTP connections if subject to extremely heavy mail traffic. This is especially important when quarantining is enabled because of the potentially large amount of quarantined mail for invalid recipients.Īlternatively, enable Automatic Removal of Invalid Quarantine Accounts (located in Mail Settings > Domains > Domains) to delete invalid user quarantine directories daily at a configured time.
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