Hello,
Mark Rigby-Jones writes:
> Briefly, we were having an issue with a spam attack from (presumably)
> a zombie network, but to add to the fun the vast majority of the spam
> connections were sitting doing nothing until exim timed them out
> while waiting for a command. Even after reducing
> smtp_receive_timeout, this was filling up the connection pool and
> stopping a lot of legitimate email coming in.
With the spam zombies being mostly dynamic, I hardly even notice them.
DynaStop whacks them off earily in the the helo section. But I have seen
an increase in my logs of their attempts.
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DynaStop: Stopping spam one dynamic IP address at a time.
http://tanaya.net/DynaStop/
