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Subject Lines That Get Opened and Answered

Your subject line decides whether an email gets opened now, later, or never. A few rules dramatically raise your open and response rates. Here's how to write subject lines that work.

Digby R. Kerr
By Digby R. Kerr — Wharton MBA, author of 12 books, founder of Kerr University™. 35+ years leading global business.

Be specific

'Quick question' tells the reader nothing. 'Question about Friday's budget deadline' tells them exactly what and lets them triage instantly. Specific subjects get opened.

Signal the action

Tell them what's needed: 'Approval needed by Wed' or 'FYI — no action.' Signaling the ask (or lack of one) respects their time and speeds replies.

Keep it short and front-loaded

Inboxes cut off long subjects on phones. Put the key words first, under about eight words: 'Reschedule: Thu 3pm → Fri 10am.' Short and front-loaded wins.

Frequently asked questions

How do I write a subject line that gets opened?

Be specific, signal the action needed, and keep it short with key words first.

Why do my emails get ignored?

Often a vague subject line the reader can't triage.

Should I note when no action is needed?

Yes — 'FYI, no action' respects the reader's time.

How can I sharpen my emails?

Book a free 30-minute class to sharpen your writing 1-on-1 with Digby R. Kerr.

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See the Fast-Track Fluency Method™ in action and meet Digby in person. No risk, no obligation.

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