The case study email – A case study on how one of your customers uses your product. Make sure to outline what problems it solves for them (tied to the problems outlined in the first email) and what benefits it brings them (tied to the benefits outlined in the second email). Include a testimonial from a customer and a call to action to signup for your free trial/free plan in this email.

When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.
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