Enabling email filter to ipv4 policy

Hi,

I just want to ask, even if after I enable "email filter" from feature visibility, I can't see email filter to the ipv4 policy just when I'm about to apply it on the policy. Please see uploaded file. My os is 6.2, do I need to reboot the firewall after enabling it on the feature visibility or do I need to enable something on the cli to be able to apply it on the ipv4 policy?

Regards,

Jeff