Top online retailers sent each of their subscribers 2.7 promotional emails on average during the week ending March 26, 2010. This represents a 9% increase in average promotional email volume from 2.5 emails the week ending February 26, 2010, according to Chad White, research director at Responsys and author of the Retail Email Blog.
Compared to March 2009, year-over-year promotional email volume increased at an even higher rate. Retailers increased their promotional email volume 13%, from an average of 2.4 emails in March 2009. (via MarketingCharts).
During the week ending March 26, 2010, the highest percentage of retailers (50%) sent a promotional email on Friday, March 26. The lowest percentage of retailers (19%) sent a promotional email on Saturday, March 20.