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petercooper
on July 23, 2013
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How Gmail’s New Inbox Is Affecting Open Rates
12500000000 / 547.5 (1.5 years) == roughly 23m e-mails per day over the 1.5 year sample.
1500000000 / (6 * 7) (6 weeks) == roughly 35m e-mails per day over the past six weeks.
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1500000000 / (6 * 7) (6 weeks) == roughly 35m e-mails per day over the past six weeks.