Largest Cyberattack In History?

One company that blocks spam has blacklisted another company that hosts websites because it's believed that they host too much spam -- as a result, the website hosting company has clogged the Internet by overloading the spam blocker with requests for service. NBC's Katy Tur reports.

One company that blocks spam has blacklisted another company that hosts websites because it's believed that they host too much spam -- as a result, the website hosting company has clogged the Internet by overloading the spam blocker with requests for service. NBC's Katy Tur reports. 

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