Exchange 2010 Receive log file showing Spammer attack records

Hi,
I do believe that our exchange server is under attack from a spammer as every day we are checking the receive log file and it showing that different IP's are trying to find open port or the open relay on our Exchange server and I’m afraid that our server protection cannot stand for long with such spammer continuous attempts.

Is there any way to stop this spammers from trying with our exchange?

Kindly check the attached file and advise what could be a proper solution to stop such trials.
RECV20131019-1-2.txt
mmmokyAsked:
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Simon Butler (Sembee)ConsultantCommented:
That is perfectly normal. Scripts are constantly running against most systems, looking for weaknesses. There is nothing to say that they will get through. If you aren't allowing authenticated relaying and have the server setup correctly then you should be fine.

You cannot stop them other than by using another host to filter your email - Message Labs, Postini, MX Logic etc. Then you can restrict the traffic to your server to just their IP addresses.

Simon.
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Simon Butler (Sembee)ConsultantCommented:
I have answered this question with comment ID: 39586238
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