66.7% of emails delivered during Q1 2011 were categorized as marketing messages, down from 74.4% the previous quarter. - Epsilon "Q1 2011 Email Trends and Benchmark" (2011)

Email is the preferred method of commercial communication by 74% of all online adults. - Merkle "View From the Digital Inbox 2011" (2011)

Personalization in subject lines dramatically reduces both open rates and click through rates -- with open rates of 6.7% (compared to 11.2% overall) and click through rate of 1.2% (compared to 1.6%). -MailerMailer "Email Marketing Metrics Report" (July 2010)

Email produced the highest response rates (4.09%) for those companies whose primary objective was to generate leads. - Direct Marketing Association, "2007 Response Rate Trends Report" (2007)

73% make the decision to click on the "report spam" or "junk" button using the from line. - Email Sender and Provider Coalition, 2007

43% of mobile email users check email four or more times per day, compared to 29% of those who do not use mobile email. - Merkle "View From the Digital Inbox 2011" (2011)

Usage of the words "You" or "Your" appeared in 20.9% of email subject lines from marketers in 2009, compared to 17.2% in 2008. -Experian Marketing Services "The 2010 Digital Marketer: Benchmark and Trend Report" (2010)

Usage of the word "free" in subject lines from marketers decreased from 16.9% (2008) to 12.4% (2009). -Experian Marketing Services "The 2010 Digital Marketer: Benchmark and Trend Report" (2010)

People who purchase after getting cart abandonment emails spend 55% more than those who buy straightaway. - SeeWhy Research (2011)

54% of people who unsubscribe from permission emails said the reason was emails coming too frequently. - ExactTarget "The Social Break-Up" (2011)

Interested in email marketing? Check out more stats here, start sending emails here, or wait for my guidebook, The Fundamentals of Email Marketing, coming very soon!