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A computer screen inbox displaying unsolicited emails known as 'spam' in Hong Kong on March 20, 2009. - 

An aggrieved sender of unsolicited email -- that is to say spam -- is reportedly behind a widespread cyberattack that's going on even now. Internet users around the world have been noticing sluggish responses from even sophisticated computer systems such as Netflix.

It all started when Spamhaus, a company that fights email spam, blocked Cyberbunker, a company that reportedly makes money from spamming. Now Cyberbunker is fighting back. The spammer believes that the blocking of its servers is an abuse of authority by Spamhaus.

Alex Cox, a lead security researcher at the firm RSA, joins Marketplace Tech host David Brancaccio to discuss the extent of the attack and when it will likely come to an end.

Follow David Brancaccio at @DavidBrancaccio