Email is still the highest-ROI marketing channel — but most people write terrible emails. The problem isn't effort. It's using generic prompts that produce generic copy. I've spent the last year testing AI email prompts and these 9 are the ones that consistently outperform everything else. Copy, paste, replace [brackets] , send. 1. The Curiosity Gap Subject Line Most subject lines either give away too much or too little. The curiosity gap sits in the middle — specific enough to feel relevant, vague enough to demand a click. Prompt: Write 5 email subject lines for [product/topic] using the curiosity gap technique. Each should hint at a specific benefit or insight without revealing it fully. Avoid clickbait — the email must deliver on the promise. Target audience: [describe audience]. Enter fullscreen mode Exit fullscreen mode Example output: "Why your automation workflow keeps failing (it's not the tool)" "The freelancer mistake that costs €300/month on average" 2.…