The only way to stop this action is to shut off Port 25 to the outside world...
With the Tons and Tons of email thats hitting your mail server things can be pretty slow... And so what these guys will figure another way in.. Correct Isn't it Microsoft??
If you get all your mail through a mail...
I have seen nasty stuff like this before. In Fact 2 Clients have has the same problem.. And they went undetected for DAYS!!!.. Well its a SIMPLE solution and I use the solution for Excessive Spam, Port 25 Attacks Etc...
You have to use some sort of Reliable Spam Gateway Service. that can Filter...
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