How to Write Email Subject Lines That Get Opened (With Examples)

BY LYNN PELZER, FEMCITY COO

In a world where inboxes are overflowing, your email subject line is the single most important line of text you’ll write. It’s your first impression — the split-second moment when a reader decides whether to open your email or move on.

Most of us scan our inboxes quickly, deleting or ignoring messages without opening them. A strong subject line can be the difference between connection and deletion.

Why Your Email Subject Line Matters

1. It’s Your First (and Sometimes Only) Chance to Be Read

No matter how valuable your message is, it won’t matter if no one opens it. Your subject line acts as a digital handshake — it invites curiosity and sets expectations for what’s inside.

2. It Builds (or Breaks) Trust

Clickbait-style subject lines may boost opens once, but they damage credibility over time. Strong subject lines balance curiosity with honesty — they promise value and then deliver it.

Trust is built when your emails consistently say what they mean.

3. It Reflects Your Brand Voice

Your subject line is an extension of your brand. Whether you’re writing as a business owner, professional, or organization, the tone should align with who you are:

• Warm and friendly

• Confident and clear

• Professional yet human

Consistency builds recognition — and loyalty.

The Hidden Value of Clear Subject Lines: Finding Emails Later

Subject lines aren’t just about open rates — they also impact organization and productivity, especially in team or office environments.

We’ve all searched for an email from months ago only to find dozens of vague subject lines like:

• “Follow-up”

• “Quick Question”

• “Update”

Clear, descriptive subject lines make searching effortless and save hours of frustration.

Examples:

Weak: Meeting
Better: Q4 Planning Meeting Notes – October 12

Weak: Update
Better: New Client Onboarding Process – Updated Version (Jan 2025)

A few extra seconds of clarity upfront can save time for everyone later.

What Makes a Great Email Subject Line

A strong subject line typically includes:

• Clarity – The reader knows what to expect

• Curiosity – Just enough intrigue to invite an open

• Relevance – Speaks directly to the reader’s needs

• Brevity – Aim for under 9 words or 60 characters

• Authenticity – Human, honest, and aligned with your voice

Pro Tips for Writing Better Email Subject Lines

• Personalize when possible
  “Lynn, your October strategy tips are here”

• Use numbers or lists
  “5 ways to refresh your brand voice”

• Ask a thoughtful question
  “Are you missing this simple marketing shift?”

• Create urgency — honestly
  “Last day to save your seat for tomorrow’s class”

• A/B test your subject lines
  Try two variations and track open rates. Data always tells the truth.

💡 For internal emails: Include searchable keywords like project names, dates, or version numbers to make future searches faster and easier.

Clear subject lines lead to clearer communication, stronger relationships, and better results. Whether you’re emailing clients, colleagues, or your community, taking a moment to write with purpose can elevate both your message and your brand.