50 Email Subject Lines That Actually Get Opened

Your subject line is the first thing your subscriber sees. Before your beautifully designed email, before your offer, before your copy — there's the subject line, competing with 50 other messages for a few seconds of attention. Here are 50 proven examples across every major category.

What Makes a Great Subject Line?

The best subject lines do one thing: make the reader curious or interested enough to open. They're specific, not vague. They're honest about what's inside. And they match the tone of your brand — casual and direct, or professional and measured.

Curiosity & Intrigue

• We almost didn't send this
• This one change tripled our open rates
• The email I've been putting off writing
• Something a bit different today
• Everyone's asking about this
• Don't open this if you're easily distracted
• What our best customers do differently
• I got this wrong for years

Urgency & Scarcity

• Ends tonight at midnight
• Last chance — 3 spots remaining
• This price goes away in 4 hours
• Today only: [specific offer]
• Final reminder
• You have until Sunday
• We're closing this down

Personalization

• [First name], a quick update for you
• I thought of you when I saw this
• Based on what you told us...
• Since you signed up for [specific thing]...
• You haven't opened our last few emails
• Happy [day of week], [first name]

Benefit-Driven

• Cut your email setup time by 80%
• How to double your open rates (with one change)
• Get more done in 2 hours than most do in a week
• Stop losing subscribers to the spam folder
• The fast way to write a campaign that converts
• 5 minutes to better email deliverability
• Your emails deserve a bigger audience

Question Format

• Are your emails landing in spam?
• What's your open rate right now?
• Why is no one clicking your links?
• Is your welcome email doing this?
• When did you last clean your list?
• What would 10,000 new subscribers do for your business?

Direct & Conversational

• Quick question for you
• A short note
• Real talk: here's what's working
• This is worth your time
• I want to show you something
• Two things
• We messed up (here's what happened)

Numbers & Lists

• 7 subject line mistakes you're making
• The 3-email sequence that generates 40% of our revenue
• 5 automations every online store needs
• One metric that predicts campaign success
• 10 words to never put in a subject line

Tips for A/B Testing Subject Lines

Don't just pick a subject line you like — test it. Send version A to 20% of your list, version B to another 20%, wait 4 hours, then send the winner to the remaining 60%. Test one variable at a time: length, tone, or hook. After 10-15 tests, you'll know exactly what your specific audience responds to.

What not to do: Test subject lines on lists smaller than 500. The sample size is too small to be statistically meaningful.