B2B email marketers: writing a business-themed email? Use terms such as “money,” “revenue,” and “profit” in the subject line, and avoid words such as “ROI,” “asset,” and “industry.” That’s one of many takeaways from a new report [download page] by Adestra, which analyzed almost 1.2 billion B2B emails sent within the past 12 months. The study examines performance metrics across a number of subject line themes – including discount, news, and content – and also looks at subject line length and personalization.
This latest study from Adestra follows from its July 2012 report, which was not limited to the B2B sector.
Adestra’s subject line study takes a look at subject line keyword metrics across a variety of themes, scoring them by relative open, click, and click-to-open rate. Below, a summary of the results by theme.
Further details from the report reveal that personalized subject lines generate significant engagement from recipients in the sense that they are 22.2% more likely to be opened. However, beyond opens, the results are decidedly worse. Personalized emails had a click rate 16.5% lower than the average, and a click-to-open rate 31.7% below the average. The researchers suggest that engagement worsens after the email open because personalization starts and ends in the subject line, and the content itself lacks personalization.
The study also examined subject line length, finding that those with 30 or less characters performed above-average in opens, clicks, and click-to-opens, while those with more than 90 characters did even better. In between, the results were closer to the average, with the 60-90 character length group faring worst.
The word count analysis follows a similar pattern. “Snappy” subject lines of 1-2 words easily performed best in each of the metrics, while those with more than 14 words also performed above-average. All other word count groups skewed closely to the average.
Of course, as the report illustrates, the words chosen for those subject lines have much to do with the success of the email.
About the Data: The Adestra report contains the following notes:
“The following research was taken from a sample of delivered email campaigns for the B2B sector resulting in an average correlation of statistics. Email marketers are advised to test their email campaigns in order to determine the optimum subject line combinations. Although subject line best practice has been advised throughout the document, we strongly advise email marketers to use relevant content and clean data in conjunction with optimised subject lines in order to realise maximum result improvements.”
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