How to Write Effective Email Subject Lines

Write Email Subject Lines That Get Opened

Want more people to open your emails? The subject line is the first thing recipients see, and it determines whether they open your message or ignore it. With inboxes flooded daily, especially in business settings, your email must stand out immediately. A well-crafted subject line increases the chances of engagement, ensuring your message gets read and acted upon.

Use the SIS Principle

Use the SIS Principle: Short, Informative, and Specific. This simple formula helps you write subject lines that capture attention while conveying key details.

Keep It Short

Start by keeping it short. Most email clients display only a limited number of characters, especially on mobile devices. Aim for no more than 25-30 characters on mobile and about 50 on desktop. If your subject line is too long, the most important words might get cut off.

Make It Informative

Make it informative. The recipient should immediately understand what your email is about. A vague or generic subject line like “Hello” or “Checking in” doesn’t provide enough context and is more likely to be ignored. Instead, be clear about the purpose of your email.

Be Specific

Be specific. If your subject line is too broad, it may not catch the recipient’s attention. Including key details ensures your message stands out and is easier to find later.

Examples of SIS Principle in Action

Here are some examples of how to apply the SIS principle in different situations:

Following Up After a Meeting

❌ Subject: “Meeting”
✅ Subject: “Follow-Up: Marketing Strategy Meeting”

Requesting a Call

❌ Subject: “Can We Talk?”
✅ Subject: “Request: 15-Min Call This Week”

Sharing Important Updates

❌ Subject: “Company News”
✅ Subject: “Exciting Update: New Product Launch”

Applying for a Job

❌ Subject: “Job Application”
✅ Subject: “Application: Digital Marketing Manager – Alex Smith”

Sending an Invoice

❌ Subject: “Invoice”
✅ Subject: “Invoice #45678 – Due March 15”

Scheduling an Appointment

❌ Subject: “Doctor Appointment”
✅ Subject: “Appointment Confirmation: Dr. Lee, April 10 at 3 PM”

Additional Tips for Effective Subject Lines

• If your email is related to a specific event or deadline, include those details to add urgency and relevance. For example, instead of writing “Reminder,” try “Reminder: Project Deadline Tomorrow.”
• Use common abbreviations when appropriate. For instance, instead of writing “Appointment,” use “Appt.” to save space without losing clarity.
• When applying for jobs, follow any instructions provided in the job listing regarding the subject line. If no instructions are given, include key information like the job title and your name for easy identification.
• Verbs like “Confirmed,” “Updated,” “Cancelled,” “Approved,” or “Requested” help clarify the purpose of your email instantly. For example:
  • “Confirmed: Marketing Team Meeting at 2 PM”
  • “Updated: Q2 Budget Proposal Attached”
  • “Cancelled: March 5 Training Session”
  • “Approved: Budget Increase for Ad Campaign”
  • “Requested: Input on Sales Report”

Mastering the art of writing effective subject lines will make a significant difference in your email engagement. Keep it short, make it informative, and be specific. That’s how you ensure your emails get opened, read, and acted upon.