TL;DR
Under 80 words for the first email. This isn't a guideline — it's statistically backed by every major sending platform's data. Emails over 150 words see significantly lower reply rates. You have 8 seconds of attention. Use them.
The data is unambiguous on this one: shorter cold emails get more replies. Here's why and how:
Why short works: Your prospect is busy. They're reading on their phone, between meetings, while multitasking. When they see a long cold email, they make a snap judgment: "This will take time to read, and I don't know if it's worth it." The email gets deferred and never read.
An 80-word email can be read in 15 seconds. They can decide in one skim whether to reply.
The 80-word formula: - Sentence 1 (10–15 words): Specific hook about them - Sentence 2 (15–20 words): The problem you're naming - Sentence 3 (15–20 words): Your solution tied to the outcome - Sentence 4 (8–12 words): A yes-or-no CTA - Signature (5 words): First name, company, title
Example — 72 words: "Noticed Acme just posted three SDR roles. Most VP Sales we work with tell us new SDRs take 90+ days to ramp, burning significant salary before a single deal closes. We've helped six other Series B fintechs get that to 45 days with a structured enablement stack. Worth 15 minutes to see if it fits your situation? — [Name], Cactus Marketing"
When to be longer: Follow-up emails (emails 3–5 in your sequence) can be slightly longer because you've already established relevance. You can add a one-paragraph case study or data point. But even follow-ups should stay under 120 words.
What to cut: - Company history ("We were founded in 2019...") - Product feature lists ("Our platform has 50 integrations...") - Multiple value props ("We help with X, Y, Z, and also A, B, C...") - Over-explaining the CTA ("I'd love to hop on a quick call to share some slides and then walk you through a demo...")
One value prop. One ask. Move on.
From Cactus: Cactus writes all client cold email under 80 words for initial outreach — we've run the A/B tests and the data consistently shows shorter wins, even when clients believe their product needs more explanation.
Cactus Marketing embeds with B2B tech startups to turn strategy into pipeline. We've worked with 60+ companies, supported 12 exits, and contributed to $7B+ in client valuations.
Book a free 30-minute call — we'll give you a concrete plan for your situation.
Book a free strategy call →How do I write a cold email that gets replies?
Write one sentence that's specifically about them, one sentence on their problem, one on your solution, and one CTA. The email should be under 80 words, reference something real about their company, and ask a yes-or-no question at the end.
How do I find leads for cold email?
Start with Apollo.io or LinkedIn Sales Navigator to build a list from your ICP criteria. Enrich it through Clay or a waterfall of data providers for verified emails. Target trigger events — recent funding, new hires, job postings — to catch companies in active buying moments.
What is a good cold email reply rate?
A good cold email reply rate is 3–8% for a broad ICP campaign and 8–15% for a highly personalized, trigger-event-based campaign. Anything above 15% with meaningful volume is excellent. Below 2% means something fundamental is wrong — ICP, targeting, or the email itself.
How many cold emails should I send per day?
New domains should warm up for 2–4 weeks before sending real campaigns, starting at 10–20 emails/day and capping out at 30–50/day per domain for sustained campaigns. With multiple warmed domains running in rotation, total volume can reach 500–2,000+/day without domain damage.