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MailChimp analyzed the subject lines of 12 billion (not a typo) messages to get to the bottom of the subject line length debate. The data indicates that as subject line length increases, nothing
happens to open rate performance.
Does this also apply to mobile open rates?
It's very frustrating to click from the newsletter to this page and there's no link to the original article (in this case, on the MailChimp blog).