One thing for smtp stuff from china would be greylisting... (postgrey)...
If I got the time I will post sth. how to use with ISPConfig...
Regarding the SSH-Stuff, I just moved my SSH port, since then I did not find any scan for ssh...
For that purpose I disabled the ISPConfig firewall (because it does not let me close port 22) and set it up on the shell via firehol
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