To be able to offload Anti-Spam processing to a FortiMail device you should.
1. Go to System > Feature Select and turn on Anti–Spam Filter.
2. Go to System > External Security Devices, enable SMTP Service – FortiMail and add the IP address of your FortiMail device.
3. Go to Security Profiles > Anti-Spam and edit an Anti-Spam profile and set Inspection Device to External.
4. Go to Policy & Objects > IPv4 Policy, add or edit a Firewall policy, enable Anti–Spam and select the profile for which you set Inspection Device to External.
When you add this Anti-Spam profile to a firewall policy, email traffic accepted by the policy is offloaded to the
FortiMail device for processing.
If your FortiGate or VDOM inspection mode is set to flow-based you must use the CLI to set an Anti-Spam profile to external mode and add the Anti-Spam profile to a fire- wall policy.
Enabling FortiMail on the External Security Devices page adds the following configuration to the CLI:
config system wccp set service-id 52
set router-id 22.214.171.124 (the IP address of the FortiGate interface that communicates with the FortiMail)
set group address 0.0.0.0
set server-list 126.96.36.199 255.255.255.255 (the IP address of the FortiMail)
set authentication disable set forward-method GRE
set return-method GRE
set assignment-method HASH
Selecting External in the Anti-Spam profile adds the following configuration to the CLI:
config spamfilter profile edit default
set external enable end
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