For the emails analyzed, those with 6-10 word subject lines had a 21% open rate. Those with subject lines containing five or fewer words ranked second with a 16% open rate, and those with 11-15 words had a 14% open rate.
Despite the effectiveness of shorter subject lines, most emails examined (52%) had subject lines of 11-15 words.
Below, additional key findings from the report, which was based on data from more than 260 million delivered emails.
Emails with the recipient's first name in the subject line had a higher open rate (18.3% compared with 15.7%).
Ayaz Nanji is an independent digital strategist and a co-founder of ICW Content, a marketing agency specializing in content creation for brands and businesses. He is also a research writer for MarketingProfs. He has worked for Google/YouTube, the Travel Channel, AOL, and the New York Times.
LinkedIn: Ayaz Nanji