The keywords "free delivery" (+50.7% higher open rate, +135.4% click rate) and "bulletin" (+15.8%, +12.7%) also performed very well in the email campaigns analyzed.
On the other hand, "report" (-23.7% average lower open rate, -54.8% click rate), "learn" (-35.5%, -60.8%), and "book" (-4.6%, -25.4%) had a negative effect. "Newsletter" showed a marginal effect on open rates (+0.7%), but had an adverse effect on click rates (-18.7%.)
As for date-related keywords, "daily" (+27.8%, +100.3%) and "weekly" (+27.1%, +50.6%) performed strongly, but "monthly" (-26.6%, -37.0%) had a negative effect.
Below, additional email subject line keyword performance broken out by B2B, B2C and commerce. For complete results and analysis check out the full study, The 2013 Adestra Subject Line Analysis Report, which was based on a review of over 2 billion global emails.
- The words "alert" and "breaking" in the email subject lines of B2B emails performed well.
- B2B customers seem to have become desensitized to words such as "reports," "forecasts," and "intelligence."
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