Incoming versus outgoing email
Available FortiMail features and their behavior vary by the direction of each email.
• Incoming
Email messages consist of messages sent to the SMTP servers that are protected domains of the FortiMail unit. For example, if the FortiMail unit is configured to protect the SMTP server whose domain name is example.com, the FortiMail unit treats all email messages sent to example.com as incoming email.
• Outgoing
Email messages consist of messages sent to recipients on domains that the FortiMail unit has not been configured to protect. For example, if the FortiMail unit is not configured to protect the domain example.com, all email messages sent to recipients at example.com will be treated as outgoing email, regardless of their origin.
See also