Spammers

I get unwanted registrations from several networks.

77.243.96.0/22 MEGALAN
112.111.0.0/16 China Unicom CHINA169 Fujian Province Network
113.96.0.0/12 CHINANET-GD
120.32.0.0/13 CHINANET-FJ
193.105.210.0/24 FOP Budko Dmutro Pavlovuch

I am inclined to block those networks (and probably others) system wide.

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