Emails with the word "alert" in their subject lines have a 38.1% higher than average open rate and 61.8% higher click rate, according to a recent study by British marketing firm Adestra.

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.

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ABOUT THE AUTHOR
image of Ayaz Nanji

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

Twitter: @ayaznanji