The AI Summary Is Your New Subject Line

The average AI email summary pulls just 29 words from your message. That's it. Twenty-nine words determine whether someone opens, deletes, or ignores your email entirely. And according to Jay Schwedelson, the game has already shifted: beautiful design matters less than what those first few lines actually say.

This is the second installment in a series on how AI summaries in Gmail, Outlook, Apple Mail, and Microsoft Copilot are reshaping email marketing. The first episode covered live text strategies. This one goes deeper into what's actually working—and what feels wrong but works anyway.

The 200-Character Formula That Lifts Click-Throughs by 19%

The most important real estate in any email is the first 150 to 200 characters of actual written live text. That's the window the AI scans to generate its summary. Schwedelson's research found a specific formula that consistently improves performance: action plus product plus deadline.

For consumer marketing, that looks like "Shop 40% off all Nike running shoes through Sunday at midnight" or "Start your 30-day Peloton free trial by September 30th and get full access to all classes." For business marketing: "Register for the 2027 HR compliance briefing by Friday to learn about these five changes in HR."