Attack on Exim SMTP 25

We have a server being attacked in the form of a botnet/DDOS.

We have installed http://www.configserver.com/free/eximdeny.html this before, which is a great dictionary attack detection script, and the server is stopping the spam attempts but its killing SMTP and giving us messages that there are too many connections to SMTP. exim_main log is going crazy, what can we do?

 

 

 

 

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