...or something like that.

At this time we are getting a tremendous amount of connections from 
completely different ip-addresses that try to send emails to recipients, 
that don't exist on our mailserver. Greylisting wouldn't help, because 
these worms/bots/whatever open several connections. I'm trying to put 
all hosts that stand out into a block lists, but that seems to be an 
infinite work.

Has someone configured something like "block all hosts for x minutes 
that try to send emails to more than y not existing recipients" with exim?

Regards
Marten

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