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Some firewall rule object (iptc) do not have a parameter attribute, which results in an exception being triggered, and the mailcow SNAT rule to never be created. Firewall rules that trigger such exception are: - -A POSTROUTING -s 192.168.122.0/24 -d 224.0.0.0/24 -j RETURN This commit just verify attribute presence, and skip the rule properly instead of triggering an exception.