Cold Email Subject Lines That Actually Get Opens

Introduction

Your subject line is your email’s first impression. It needs to draw attention without sounding spammy.

1. Use curiosity, not clickbait

Phrases like “What you might be missing” or “Here's a weird trick” make people curious. Just don’t trick them.

2. Use numbers and benefits

Numbers stand out. Subjects like “Save 10 hours a week” or “Boost sales by 50%” are clear and eye-catching.

3. Personalize when you can

Including the person’s name or company can boost opens by over 20%. It makes your email feel made just for them.

4. Try “RE:” carefully or avoid it

Some say leading with “RE: Competitor Name” tricks spam filters and works well. Others say it feels dishonest. Use with care.

5. Keep it short and clear

Short subject lines are easy to read on mobile. Keep them simple and to the point.

Conclusion

A good subject line uses curiosity, numbers, or personalization but never lies. Keep it honest, helpful, and fitting for your message.