See one of my older posts which I have updated: https://blog.gahanzwart.nl/linux/logwatch-mail-showing-no-iptables-entries-in-ubuntu-mint/
Letting logwatch output firewall stuff on Debian derivates (probably Red Hat derivates too)

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See one of my older posts which I have updated: https://blog.gahanzwart.nl/linux/logwatch-mail-showing-no-iptables-entries-in-ubuntu-mint/