"With the myriad of tools available on the market, it makes good business sense for a company to identify to the potential 'holes' in their security system and then select a tool that will automatically safeguard it from a potential emergency," he explains.

For example, certain tools on the Internet automatically scan for open relay servers, or machines that have not been secured to prevent their being used to relay spam. These tools will automatically detect and blacklist domains, thereby blocking mail from those domains to others that check blacklists before accepting mail. De-listing is often as simple as fixing the problem and notifying the blacklist that this has occurred.

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