Spam detection is a key feature of the FortiMail unit. The feature is based on two tiers of spam defense:

Each tier plays an important role in separating spam from legitimate email. FortiGuard Antispam delivers a highly-tuned managed service for the classification of spam while the FortiMail unit offers superior antispam detection and control technologies.

In addition to scanning incoming email messages, FortiMail units can also inspect the content of outgoing email messages. This can help eliminate the possibility that an employee or a compromised computer could send spam, resulting in the blocklisting of your organization’s email servers.

For more information on FortiMail antispam techniques, see “Configuring profiles” and “Configuring antispam settings”.