Nice article on Campaign Monitor examining subject lines for retail newsletters. Worth noting that research shows 28% of subscribers sign up for a company’s email list to stay informed, and another 27% subscribe to save money.
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Mailchimp’s set of popular words coming from a dataset of over 9.5 billion emails:
posts, jobs, survey, week’s, e-newsletter, issue, digest
Hubspot’s top 7 words pulled from data from over 500,000 emails:
secret, e-sales, awesome, skills, ebook, helpful, shipping