How to configure exchange to use before message delivery

How can I configure exchange to use so we can reduce the amount of spam in the environment?

I think this is a 2 step process, but I am not sure.

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ArathConnect With a Mentor Commented:
Assuming it is Exchange 2003 since you did not specify if it was exchange 2003 or exchange 2007.

I do not know if the needs any registration, but for configuring the blocklist follow the description on this link

To activate the filter:
Then go to administrative groups -> first administrative group -> servers -> your mailserver -> protocols -> smtp

Right click Default smtp server.
On general tab press advanced
Choose your ip adress/ (all unassigned) and press edit
click Apply connection filtering

Then ok back to system manager.
Ehab SalemConnect With a Mentor IT ManagerCommented:
I am using the following RBls and it blocks more than 90% of SPAM:

They are all free
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