Ahhh, Help needed - Spammers

It seems like some people are able to freely send e-mail through my servers, even though they are not users.

I dont know how to stop this, its sending the load on the server very high. I can see the ip number of the person doing it in the exim logs and even added it in the hosts.deny file but that hasnt stopped it.

Any help would be much appreciated.

 

 

 

 

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