Article

17 Best Cold Email Subject Lines for Higher Open Rates

Kimberlee Meier · Close Free Beginner

Close is a sales CRM built by working sales leaders, and this piece (reviewed by co-founder Steli Efti) draws the line between a subject line that provokes real curiosity and one that is just a trick. You get seventeen concrete, swipeable patterns plus a warning about the ones that damage trust the moment the email opens and does not deliver. Good for turning the question's abstract advice into something you can actually type today.

  • A subject line should promise something specific the body actually delivers, not a bait-and-switch.
  • Numbers and named goals outperform vague value claims, but only if you can back them up.
  • Track which subject lines you send against replies, not just opens, to know what is actually working.
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The question it answers

  1. What should my very first cold email subject line actually say?

Read with it

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  2. This is the canonical structure for the investor cold email, written by a YC partner who reads them from the other side. It is... Y Combinator Startup Library Essay · 5 min read How to Cold Email Investors Aaron Harris
  3. Once you have a list of people to reach cold, this shows you how to write emails they actually answer. Seven concrete... Y Combinator Startup Library Video · ~33 min How to Convert Customers With Cold Emails Aaron Epstein
  4. Podcast · 50 min How Khadim Batti Built Whatfix Into a Global SaaS Leader (500 cold emails to first customers) Khadim Batti with Prime Venture Partners
  5. A short, direct conversation between two founders on when cold email works, who to send to, and how to write the subject line... The Startup Chat with Steli and Hiten Podcast · 18 min The Startup Chat, Episode 014: Cold Email Steli Efti and Hiten Shah
  6. This collection was built for asking strangers for small favors like introductions and advice, which is a gentler version of... 80,000 Hours Article The Best Email Scripts for Cold-Emailing Benjamin Todd
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