The Radicati Group estimates that 74.5 billion emails will be sent and received worldwide every day by the end of 2017. This is actually less than the 82.6 billion that are expected to be sent and received this year. In light of inbox overload, Unroll.Me has launched an free email management tool that allows consumers to mass unsubscribe from marketing emails. Chad White, lead research analyst at Salesforce's digital marketing software provider ExactTarget, says that marketers should be worried. He compared the service to Gmail's "Promotions" tabs.