Why guess? :) http://www.email-marketing-reports.com/metrics/email-statistics.htm http://www.email-marketing-reports.com/metrics/email-statist... If you're in

Why guess? :) http://www.email-marketing-reports.com/metrics/email-statistics.htm http://www.email-marketing-reports.com/metrics/email-statist... If you're inclined to believe what the companies say about its own services.