Email Open & Click Rates By Subject Line Length, 2013 [CHART]

Email newsletters with short subject lines of between 4-15 characters sported the best open rates last year, according to a MailerMailer analysis of almost 1.2 billion emails, with longer subject lines generally tied to lower open rates. That same pattern extended to click rates, which were highest for emails with the shortest subject lines. Source: MailerMailer

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