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Email Marketing Statistics and Metrics
Email's ROI in 2009 was $43.52 for every dollar spent on it. - DMA (2009)
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Email Testing

According to the Econsultancy/Adestra Email Marketing Industry Census 2013, only half of businesses (49%) are currently testing the time and day of their email messages. - Adestra "2013 Email Marketing Industry Census" (2014)

74% of email marketers report having an 'excellent' or 'good' ROI, compared to just 37% who do not test. - Econsultancy/Adestra "Email Marketing Industry Census 2013" (2013)

24% of digital marketers surveyed tested 75% - 100% of their email campaigns; the same percentage (24%) tested only 1% - 10% of their campaigns. - Lyris "The Lyris Digital Optimizer Report" (2012)

83% of those surveyed believe testing varying subject lines drives the best results. The next most effective testing method rated by 75% of those surveyed is varying content/messaging. - Lyris "The Lyris Digital Optimizer Report" (2012)

Less than a third of email marketing companies regularly test their email marketing campaigns. - Econsultancy "Email Marketing Census 2012" (2012)

23.9% organizations engage in testing and optimizing all aspects of an email - Marketing Sherpa "2012 Email Marketing Benchmark Report" (2012)

58% of respondents test to see what type of content results in the best click-through-rates; 57% test for a correlation between subject lines and open rates; and 46% test to see how open rates are affected by time of day. - Pardot "Survey Reveals Changing Role of Email Marketing" (2012)

Only 25% of marketers test their emails for accurate mobile rendering. - Pardot "Survey Reveals Changing Role of Email Marketing" (2012)

Only a third of responding companies (32%) carry out a regular amount of testing for email marketing. One quarter of organisations say they infrequently carry out testing, while 13% don't test at all. - Econsultancy "Email Marketing Census 2011" (2011)

51% of US online marketers currently use email A/B testing strategy, with an additional 25% planning on doing so in the future. - Lyris (2010)

48% of marketers test subject lines on a regular basis. - MarketingSherpa (2010)

47% of marketers regularly test offers/Calls to Action in their emails. - MarketingSherpa (2010)

56% of the world's heaviest online advertisers revealed that they had budgeted significantly for landing-page A/B tests in 2007. -MarketingSherpa (2007)

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