
July 2, 2026
FREE! The email subject line rules that don’t hold up!
Email marketers have spent years following the same advice: use power words, personalize subject lines, avoid ALL CAPS, and keep punctuation to a minimum. A new study suggests some of those rules may be hurting performance instead of helping it. Researchers at the University of Helsinki analyzed 31,812 marketing email subject lines sent a combined
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Published by martech.org
