Outgoing Recipient Safelisting

Hi all ! My fortimail unit is configured in gateway mode. Internal mail servers route messages to the inernet through fortimail unit.  Option Domain - User - User Preference - Outgoing Recipient Safelisting is ON for all users. When I try  and send mail message from my mailbox through fortimail unit to the external mailbox, my personal safelist is empty and nothing is going on. What did I miss in my configuration?   As i see in the documentation " The icon indicates whether or not the FortiMail unit will automatically add recipient addresses in outgoing email sent by this email user to their per-user safe list, if it is allowed in the antispam profile." I do not see any options in Antispam profile. My appliance version is 5.4.4.