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A botnet which experts believe sent out 18% of the world's spam email has been shut down, a security firm said.
Grum's control servers were mainly based in Panama, Russia and Ukraine.
Security company FireEye and spam-tracking service SpamHaus worked with local internet service providers (ISPs) to shut down the illegal network.
FireEye collaborated with other experts in the worldwide security industry to apply pressure to local ISPs to suspend the illegal operation.
Mr Mushtaq said more than 20,000 computers were still part of the botnet, but that without the active CnCs they would soon be rendered ineffective.