Guang Dong, is indeed (in)famous for their spams. Since we do not support users from this spam-made-famous hotspot on Earth, we happily blocked all the IP addresses that knocked our door and the result has been good. Most of them are dynamic IPs, which shouldn't be saying HELO to our servers in the first place anyway.
Guang Dong - ChinaNet
61.140.0.0 - 61.146.255.255
183.7.0.0 - 183.7.255.255
Guang Dong - Unicom
120.82.0.0 - 120.82.255.255
221.4.0.0 - 221.5.127.255
Guang Dong - Railcom
58.253.19.205
Well, if you choose to do or have done something similar, we welcome you to add your feedback in the comments. :-)
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