Sender reputation scores can be affected by sender validation results. |
Enabling sender reputation can improve performance by rejecting known spammers before more resource-intensive antispam scans are performed. |
GUI item | Description | |
Enable sender reputation checking | Enable to accept or reject email based upon sender reputation scores. The following options have no effect unless this option is enabled. | |
Throttle client at n | Enter a sender reputation score over which the FortiMail unit will rate limit the number of email messages that can be sent by this SMTP client. Entering 0 means no score limit and thus no action. But FortiMail still monitors the sender reputation and increases or decreases the sender reputation scores accordingly. The enforced rate limit is either Restrict number of emails per hour to n or Restrict email to n percent of the previous hour, whichever value is greater. | |
Restrict number of emails per hour to n | Enter the maximum number of email messages per hour that the FortiMail unit will accept from a throttled SMTP client. | |
Restrict email to n percent of the previous hour | Enter the maximum number of email messages per hour that the FortiMail unit will accept from a throttled SMTP client, as a percentage of the number of email messages that the SMTP client sent during the previous hour. | |
Temporarily fail client at n | Enter a sender reputation score over which the FortiMail unit will return a temporary failure error when the SMTP client attempts to initiate a connection. Entering 0 means no score limit and thus no action. But FortiMail still monitors the sender reputation and increase or decrease the sender reputation scores accordingly. | |
Reject client at n | Enter a sender reputation score over which the FortiMail unit will reject the email and reply to the SMTP client with SMTP reply code 550 when the SMTP client attempts to initiate a connection. Entering 0 means no score limit and thus no action. But FortiMail still monitors the sender reputation and increase or decrease the sender reputation scores accordingly. | |
Check FortiGuard Block IP at connection phase | Enable to query the FortiGuard Antispam Service to determine if the IP address of the SMTP server is blocklisted. And this action will happen during the connection phase. In an antispam profile, you can also enable FortiGuard block IP checking. But that action happens after the entire message has been received by FortiMail. Therefore, if this feature is enabled in a session profile and the action is reject, the performance will be improved. |