Ninety seven percent of sending IP addresses’ reputations are so bad that e-mail box providers are likely to block their messages, according to a study by e-mail deliverability concern Return Path.

Moreover just 0.9% of sending IP addresses scored well enough that their e-mail is likely to be delivered, the company determined.

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Return Path's George Bilbrey: "when it comes to email deliverability, reputation is the most important element for marketers to work on. It matters more than content, subject lines, and the typical cosmetic fixes that marketers gravitate toward. Sure, content matters for driving response. But it does not make much difference when it comes to blocking and filtering."

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