Top-Performing Email Subject Lines for 2025

Email subject lines can make or break an email campaign. A recent analysis of high-performing email campaigns in 2025 reveals that subject lines with personalisation, brevity, and a touch of curiosity significantly outperform generic or lengthy ones. The data indicates that:

• Subject lines under 50 characters have an open rate of 48%, compared to 35% for longer ones.
• Adding personalisation, like the recipient’s name, boosts open rates by 22%.
• Curiosity-driven subject lines, such as questions or teasers, drive 18% higher click-through rates than straightforward messages.

Crafting effective subject lines requires striking a balance between creativity and clarity. Avoid excessive punctuation or overly sales-driven language that might trigger spam filters. Instead, focus on providing value, whether it’s a solution to a pain point or an exciting announcement.

One strategy to consider is A/B testing subject lines. This allows you to measure which style resonates most with your audience. Ultimately, understanding your recipients’ preferences and consistently refining your approach can lead to better engagement and higher conversions.

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