Notes: Email newsletters with short subject lines of between 4-15 characters sported the best open rates last year, according to a MailerMailer analysis of almost 1.2 billion emails, with longer subject lines generally tied to lower open rates. That same pattern extended to click rates, which were highest for emails with the shortest subject lines.
About the Data: The results are based on data from more than 62,000 newsletter campaigns and approximately 1.18 billion email messages sent. The report only used data from customers with 25 or more list members. Click rate metrics exclude emails that did not have any links in them.