FREE! The email subject line rules that don’t hold up!

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