In a move to shake the weak economy, retailers increased their e-mail volumes by 45% during the holiday season, according to the Email Experience Council. In its report, the Email Experience Council looked at volume data collected by RetailEmail.Blogspot on 109 of the top online retailers and defined the holiday e-mail season as the six-week period running from November 10 to December 21. It was compared to the 12-week period that preceded it, August 18 to November 9. At the peak of the season, during the week ending December 21, retailers sent 3.3 e-mails each on average, up from the 1.9 e-mails sent in the pre-holiday season.