[exim] Reducing spam

Hi all,

I am trying to reduce the spam mails being sent from my cPanel server. I am
testing different methods by searching in forums. I have noted that some
companies are implementing a technique to reduce the spam mails which being
sent from the scripts in the server. Can any one suggest how can I
implement the same or any better idea to reduce the spam mails which being
sent from scripts....

Following is the rules I have mentioned :
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* Either the FROM or TO address needs to be hosted on the server

The FROM or TO address has to be anything@???. For
example, if your domain name is testdomain.com, then the FROM or TO address
that you need to use in the script is abc@??? or @testdomain.com.

*If the FROM address has been mentioned as
primary-username@server-namethen the TO address compulsorily needs to
be mentioned as
anything@???

Let's consider the following scenario :

Domain name : testdomain.com
Primary User : testdo
Server name : server cp-00.webhostbox.net.

If the FROM field in your script is mentioned as
testdo@???, your TO email address has to be @
testdomain.com

If the above rule isn't followed in the script then all mails will get
blocked.
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Thanks