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How to Write Must-Open Email Subject Lines
Do you struggle to write subject lines that get your emails opened? Many marketers face blank page syndrome when trying to craft engaging emails that drive clicks and sales.
That’s why we’ve put together 16 proven subject line formulas used by six and seven-figure marketers. These examples have been tested in real campaigns and work across niches — from affiliate marketing to solo ads list building.
Want done-for-you email swipes tested for solo ad traffic? Try our OptinWizard Swipe Machine
1. Subject Lines with Results/Benefits + Time
Promise a clear benefit with a defined timeframe.
Example: “Lose 10 Pounds in 7 Days” works better than just “Lose 10 Pounds.”
2. Problem + Solution Subject Lines
Highlight a pain point and present the solution.
Example: “Embarrassed by Hair Loss? Discover the Fix Inside.”
3. Curiosity-Driven Subject Lines
Make readers click to satisfy curiosity.
Example: “The Drink That Destroys Fat Cells (Revealed).”
4. Shock Subject Lines
Surprise or shock to grab instant attention.
Example: “Why Traditional Wedding Planning Is Dead.”
5. Review Subject Lines
Show you’ve done the work for them.
Example: “Which Weight Loss Program Actually Works?”
6. “How To” Subject Lines
Promise a quick, useful lesson.
Example: “How to Improve Your Golf Swing in 7 Days.”
7. Direct Command Subject Lines
Tell the reader exactly what to do.
Example: “Stop Struggling with Traffic Starting Today.”
8. Problem Question Subject Lines
Call out a common struggle in question form.
Example: “Are You Still Wasting Money on Bad Traffic?”
9. Revealing Question Subject Lines
Make readers feel they’re missing out.
Example: “Are You Using This Lead-Getting Tool?”
10. Offer Subject Lines
Highlight a deal directly.
Example: “15% Off Solo Ad Traffic Today Only.”
11. Negative Subject Lines
Use bad news to spark attention.
Example: “Why 500 Online Businesses Got Shut Down.”
12. List Subject Lines
Offer easy-to-read listicle-style value.
Example: “21 Ways to Boost Email Opens Fast.”
13. “Why I Don’t…” Subject Lines
Break the mold and create intrigue.
Example: “Why I Don’t Use Social Media for Leads.”
14. “This Email Contains…” Subject Lines
Suggest there’s something valuable inside.
Example: “This Email Contains the Secret to More Subscribers.”
15. “X Mistakes Even Pros Make” Subject Lines
Highlight errors even smart people make.
Example: “5 Mistakes Even Experienced Marketers Still Make.”
16. “Who Wins in a Fight…” Subject Lines
Create controversy or curiosity with comparisons.
Example: “Who Wins: SEO or Email Marketing?”
Next Steps
Subject lines are just the start. To really convert traffic into buyers, you need proven email sequences and reliable traffic sources.
Want done-for-you motivational emails? Try Quote GPT Want story-based emails that build trust? Use Story Emails GPT Need fresh leads? Buy premium traffic from OptinWizard Solo Ads
With the right subject line, the right email, and the right traffic — you can scale your list and sales faster.
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