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📈 Pro Strategy7 min read

Email Subject Lines That Get Replies (Not Deleted)

Boost open rates by 25% with these proven formulas.

CampaignForge Team
March 16, 2026

The Science of Getting Opens

Your subject line determines whether your email gets opened, archived, or deleted. Here's how to get more opens and replies.

High-Performing Formulas

  • Specific number + benefit: “5 ways to save on AC repairs”
  • Personalization: “[Name], your quote is about to expire”
  • Curiosity gap: “You're not going to believe this…”
  • Urgency: “Last chance for this week's availability”

The One Mistake to Avoid

Don't use all caps, excessive punctuation (!!!), or spam trigger words. These tank deliverability and make you look desperate.

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