Good subject lines are short, unique, relevant, useful, relatable, and tied to a next action. These six qualities maximize open rates.
Short
Limited space available. Keep things concise and impactful.
Unique
Stand out from hundreds of other emails in their inbox.
Relevant
Tie to something the recipient actually cares about.
Useful
Offer helpful information or valuable benefits upfront.
Relatable
Make yourself approachable with personal context.
Action-Oriented
Suggest or imply what the recipient should do next.
What Are the Best Cold Email Subject Lines?
Cold email subject lines work best when they offer help, ask questions, or reference specific pain points relevant to the recipient.
These subject lines are for contacting someone you’ve never met before, with no specific introduction to leverage. The Benjamin Franklin effect suggests people like you more after doing you a favor—which is why asking for help often works well.
10 Cold Email Subject Lines
- Introducing myself — Simple, works in almost any situation
- Can you help me? — Leverages altruism and the Benjamin Franklin effect
- Quick question about [topic] — “Quick” assures minimal time investment
- Hoping I can help! — Reverses the dynamic by offering value first
- [Results] in [timeframe] — Example: “25% more sales in 4 weeks”
- Ideas for [pain point/topic] — Catches prospects at the perfect time
- Nice to meet you, [name]! — Name personalization compels opens
- Feeling overwhelmed by [topic]? I can help. — Establishes authority
- I noticed you’re also interested in [topic] — Creates conversation starter
- Your goals — Opens dialogue about objectives and needs
What Are the Most Catchy Sales Email Subject Lines?
Catchy subject lines use personal connections, flattery, curiosity gaps, or unconventional approaches that stand out from typical sales emails.
15 Catchy Sales Email Subject Lines
- [Connection] recommended I reach out — Leverages networking referrals
- [Contact] referred me… — Trails off to pique curiosity
- Hi [name], quick question for you — Personal + time-conscious
- Did you find what you were looking for? — Great for website visitors
- We met at [location] — Perfect for post-event outreach
- Will I see you at [location]? — Builds anticipation for upcoming events
- Fellow [university] alum! — Creates immediate personal link
- I’ll cut to the chase — Promises a quick, anti-salesy email
- Let me know if I’m wrong… — People love to correct others
- I can make your life [statistic] easier — Concrete benefit with data
- Let’s be real here — Sets up an honest, direct message
- I loved your [work]! — Flattery that shows you did research
- Nice work on [topic]! — Variant praising specific achievements
- I heard you’re an expert on [topic] — Flattery + conversation starter
- Can you keep a secret? — Creates irresistible curiosity
What We’ve Observed
In our testing, subject lines that ask for help (“Can you help me?”) consistently outperform direct sales pitches by 15-25%. The Benjamin Franklin effect is real—people like you more after doing you a favor.
What Subject Lines Work Best for Meeting Requests?
Meeting request subject lines should be direct and specific. Include the proposed date/time or simply ask about availability.
4 Meeting Request Subject Lines
- Are you available [date/time]? — Direct and to the point
- [time/date] – are you available? — Leading with the date creates urgency
- Would love to meet on [date] — Implies they’re doing you a favor
- Time to touch base? — Open-ended request for future connection
What Are the Best Content-Based Sales Email Subject Lines?
Content-based subject lines lead with valuable resources like whitepapers, blog posts, webinars, or ideas that solve prospect problems.
6 Content-Based Subject Lines
- [Content Title] — Strong content headlines double as great subject lines
- X ideas for [topic/problem] — Numbers promise digestible, scannable content
- Whitepaper on [topic] – thought you might be interested — “Whitepaper” carries authority
- Want to learn more about [topic]? — Pick challenging topics to stand out
- [Name], are you interested in these blogs? — Personalized content curation
- Upcoming webinar – are you interested? — Builds anticipation for events
What Are the Best Follow-Up Sales Email Subject Lines?
Follow-up subject lines should change tactics from your original email. Try different angles, acknowledge their time, or use humor.
Most people won’t respond to your first email. They may find themselves clicking on the third or fourth email you send. Reverse psychology can work—but use it sparingly.
16 Follow-Up Subject Lines
- Next steps! — Implies prior engagement (use carefully)
- X action items to get started — Numbers make emails seem approachable
- You’re busy – but can you spare 5 minutes? — Empathy + time promise
- X steps to [goal] — Promise achievable progress
- I’d love to get your feedback — Opens door to learn why they’re not responding
- I dare you not to open this message — Reverse psychology (sometimes works)
- [Your company] and [their company] – can we work together? — Partnership framing
- Not interested in [topic]? — Verifies lack of interest or re-engages
- Are you satisfied with your [strategy]? — Direct qualification question
- Closing your file… — Creates urgency (slightly guilt-trippy)
- Last chance — Works best with specific offers attached
- If you change your mind… — Graceful exit that leaves door open
- X quick ideas before you go — One last value offer before stopping
- Are my assumptions correct? — Invites feedback and correction
- Aren’t you tired of persistent salespeople? — Self-aware humor works well
- Real quick – I forgot something — Seems human and creates curiosity
What We Recommend
Self-aware subject lines like “Aren’t you tired of persistent salespeople?” generate surprisingly high open rates. The humor disarms recipients, and acknowledging that you’ve been sending multiple emails creates warmth and relatability.
How Do You Test Sales Email Subject Lines?
Use subject line testers like SubjectLine.com to check deliverability and appeal, then measure open rates across different variations.
Subject line testers evaluate deliverability (to avoid spam triggers) and marketing appeal. Then measure actual performance through open rates, click rates, and click-to-open ratios. Take the subject lines that perform best, modify them further, and discard underperformers.
Testing Process
- Run subject line through a tester for spam score and appeal rating
- Send to a small test segment and measure open rates
- Compare performance across multiple subject line variations
- Keep top performers and iterate on them
- Discard subject lines that underperform
Frequently Asked Questions
Jayson is a long-time columnist for Forbes, Entrepreneur, BusinessInsider, Inc.com, and various other major media publications, where he has authored over 1,000 articles since 2012, covering technology, marketing, and entrepreneurship. He keynoted the 2013 MarketingProfs University, and won the “Entrepreneur Blogger of the Year” award in 2015 from the Oxford Center for Entrepreneurs. In 2010, he founded a marketing agency that appeared on the Inc. 5000 before selling it in January of 2019, and he is now the CEO of EmailAnalytics and OutreachBloom.
