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On average, emails sent by marketers on Mondays have more errors in their subject lines than do emails sent on other days of the week, according to research from Boomerang.

The report was based on an analysis of 250,000 campaigns sent by brands in 2016. The researchers passed the messages through an automated grammar and sentiment checking tool to measure how error rates and tone change over the course of the week.

Campaigns sent on Mondays have the most errors (spelling mistakes, grammatical issues, improper capitalization, etc.) in subject lines, on average.

Emails sent on Fridays have the second-most errors in subject lines, on average.

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image of Ayaz Nanji

Ayaz Nanji is a digital strategist and a co-founder of ICW Media, a marketing agency specializing in content and social media services for tech firms. 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