Question : What is IronPort?

Hi,
I'm new to messaging, so can someone explain the concept of Ironport and Spam lists like senderbases? How does centerbase get updated about the IP address and the magnitude of spammers? What are the different reasons why an IP can be blacklisted? Is there an online userguide or any documents that i can refer to? I tried the ironport site, but that requires the serial no of the Ironport device to which i do not have access.

Any help is greatly appreciated.

thanks,
CoolJai

Answer : What is IronPort?

One point to start: http://ordb.org/
IronPort: http://www.ironport.com/technology/ Just another one..
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