INBOX INSIGHTS

How to Write Email Subject Lines That Boost Open Rates

Why Your Email Subject Line Matters

Your email subject line is the first thing recipients see in their inbox. If it’s not compelling, your email might never get opened. A strong subject line can increase open rates, engagement, and conversions.

Best Practices for Writing High-Performing Subject Lines

1. Keep It Short & Sweet – Aim for 40-50 characters to ensure your subject line is fully visible.

2. Use Personalisation – Adding the recipient’s name or location increases open rates.

3. Create Urgency – Phrases like “Limited Time Offer” or “Last Chance” drive immediate action.

4. Ask a Question – Engaging questions spark curiosity. Example: “Are You Making These Email Mistakes?”

5. A/B Test Your Subject Lines – Always test variations to find what resonates best with your audience.

Words That Improve Open Rates

Using power words can make a big difference. Try incorporating:

Exclusive

New

Limited

You/Your

Secret

Common Subject Line Mistakes to Avoid

❌ Using ALL CAPS (can look spammy).

❌ Overuse of emojis 🙄🔥📢.

❌ Misleading subject lines (this can lead to high unsubscribe rates).

Need Help Crafting High-Performing Emails?

At The Emails Guy, we create compelling subject lines as part of our email campaign management services. Let’s optimise your email performance!

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