The size of a marketing email campaign and the sender's industry have a significant impact on open rates, according to a recent report from Constant Contact.

The report was based on data from an analysis of the more than 100 billion emails sent in 2014 and 2015 by more than 650,000 global Constant Contact clients. The campaigns were sent by businesses in wide range of B2B and B2C industries and nonprofit groups.

Below, key findings from the report.

Campaign Size

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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