Average e-mail click-through rates dropped 0.1% in the fourth quarter of 2008 from the third to 5.8%, the lowest ever recorded, according to a study released today by Epsilon.
They are down from 6.1% in 2007 and 6.5% in 2006, according to the marketing services provider.
Kevin Mabley, senior vice president of strategic services for Epsilon, contends a number of factors are at work.
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