Block entire countries IP address
-
You can search for "network block list" to see how; but you need to find or curate your own list of IP ranges.
It would be very nice to have a DNS based block so you can do entire TLDs w/o caring about IP ranges or AS routing networks. This would also block all IPs w/o reverse DNS.
-
See also this topic for a system wide approach: https://forum.cloudron.io/post/19901 and https://forum.cloudron.io/topic/3795/firewall-spamassassin-automatic-list-update/