In many cases it is certainly proper and allowed to block another network
Should be allowed in all cases. I guess there is no law wherever in the world that disallows me to protect my own services from abuse. And no law whatsoever that pushes me, that I have to communicate with everybody in the world, even if I dont want to. That will make every antivirus- or firewall-software illegal. Dont simply think of abuse as spam, abuse is more (e.g. every day, we have idiots, that are trying to guess mailbox passwords or that try to log into network appliances, wich only have an IP and no domain pointing to them, surely until their IPs get captured and blocked, our IDS and firewall logs are full of this crap). And how could it be defamation, if we try to reach the responsible network abuse contact, to inform them, that they have a security breach and that one of their servers or dialin clients got hi-jacked ? Blacklist do not accuse anybody, they are simply informative and tell people that there might be a problem ...
Huh?
How is listing an IP or netblock as a source of network abuse defamatory?
That's the kind of defence used by spammers
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