Hi,

A very good reading is here 
https://github.com/Exim/exim/wiki/BlockCracking



28 janvier 2015 16:23 "Sujit Acharyya-choudhury" <[email protected]> a 
écrit: 
> We had an incident when an account was compromised and lot of mail was
> sent from that account over the weekend before we could do anything. Do
> you think if we had rate limit for every sender in place, it would have
> limited the damage? BTW, we don't even get 100 mails/day from one
> particular user, so rate limit for all the user to 100/day would have
> seem to be a good damage control in case of compromised accounts in
> future.
> 
> Regards
> 
> Sujit
> 
> Sujit Choudhury
> 
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