On Tue, 07 Jun 2011 21:58:20 +0000, W B Hacker wrote: 

> By
'clients' do you mean:
> 
> - user's who cannot type consistently or
have set their MUA correctly
> 
> - *former* user's whose MUA have not
had their old accounts 
> disabled/removed.
> 
> - apparent break-in
attempts
> 
> And in any case, on which arrival port(s) and with which
protocol?
> 
> The problem should go away with no need to blacklist if
you get the 
> combination set optimally.
> 
> Bill
> -- 韓家標

I
think for the last one fail2ban or something like that should be enough.
First two are a good example why you should be careful when tuning
fail2ban to avoid legal users blacklisting. 

  
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