# How do you write a cold email people actually read? > A cold email earns attention fast or not at all. Two-word subject lines, an insight before any pitch, a colleague's tone, and follow-ups that add something. - Canonical page: https://warmup.ai/blog/how-to-write-a-cold-email-people-read - By Deisy Lewis, chief strategy officer of WarmUp. Published 2026-10-29. - Category: GTM engineering (https://warmup.ai/blog/category/gtm-engineering) - Part of: GTM engineering (https://warmup.ai/gtm-engineering) - Tags: cold email, outbound, copywriting, follow-up ## Key takeaways - A cold email either earns attention fast or loses it, so every part of it is written to be read in a glance. - Use a subject line of two or three words, and open with an insight or observation, not a pitch or your company. - Write like you would message a colleague, and keep the whole email under 500 characters. - Follow up with purpose. Each follow-up adds something new, such as a fact, an idea or a question, instead of a bump. People read a cold email when it looks like a note from a person and says something useful in the first line. Keep the subject line to two or three words, open with an insight or an observation instead of a pitch, write like you would message a colleague, and stay under 500 characters. Then follow up with something new each time. I shared these rules in a short series of posts on my [LinkedIn](https://www.linkedin.com/in/deisylewis/). A cold email either earns attention fast or loses it, and most cold emails read like brochures, which is the fastest way to get marked as spam. This is the full version, with the reasoning behind each rule. ## How long should a cold email subject line be? A cold email subject line should be two or three words. Short subject lines look like they came from a person, and long ones look like marketing. "Quick question" beats "Q2 Strategy Proposal for Enterprise SaaS Leaders", because the reader decides in a glance whether this is a note to them or a campaign aimed at everyone. The subject line has one job: get the email opened by someone who does not know you. It is not the place to explain your offer. A short, plain subject line that a colleague might send does that job better than any clever headline. Test it by reading your subject line next to the ones in your own inbox from people you know. If yours is the only one that sounds like a campaign, shorten it until it does not. ## How should a cold email open? A cold email should open with value: an insight or an observation the reader cannot ignore, not a pitch and not your company. The first line decides whether the rest gets read, so it should be about them, their company or their market, and it should be something true and specific. Compare two openings. "We are a firm that helps B2B companies grow" is about you, and could be sent to anyone. A line about something that has just changed at their company, or a pattern you have noticed across their market, is about them. This is why the work before writing matters. You cannot open with an insight if you know nothing true about the person. A signal, such as a new hire or a funding round, gives you that first line, and the [signal-based list post](https://warmup.ai/blog/how-to-build-a-signal-based-outbound-list) covers where they come from. ## What should the body sound like, and how long should it be? The body of a cold email should sound like a message to a colleague and run under 500 characters. Write naturally, not like you are begging for a call. Keep it scannable, light and conversational. If the email looks like a wall of text on a phone, it will not be read, however good the words are. Five hundred characters is a few short sentences. That is enough to say why you are writing, what you noticed, and one simple question. It is not enough for a feature list, and that is the point. If you cannot fit the email in that space, the problem is usually that it is trying to do too much. - **One idea per email.** If you have three things to say, you have three emails. - **Short paragraphs.** One or two lines each, so it reads on a phone. - **One easy question at the end**, the kind a person can answer in a line. ## Where does social proof go in a cold email? Social proof goes in as one line about your impact, not a paragraph. A single sentence about what you have done for a company like theirs gives the reader a reason to believe you, without turning the email into a brochure. More than that, and the email is about you again. The line should be specific and honest. A real result for a similar company is worth more than a list of logos, and a claim you cannot back up is worth less than nothing. If you do not have a result you can share yet, leave the line out rather than inventing one. ## How should you follow up on a cold email? You should follow up on a cold email with purpose. A cold email does not have to convert on the first try, and the real pros follow up. But each follow-up adds something new, such as a useful fact, a fresh idea or a better question, instead of just bumping the thread. A bump says "did you see my last email?" and gives the reader nothing to respond to. A follow-up with something new gives them a second reason to reply, and shows you were thinking about their problem rather than your quota. Writing good emails is only half of it. The other half is making sure they arrive, which is about the sending setup in [how many sending domains outbound needs](https://warmup.ai/blog/how-many-sending-domains-and-mailboxes-does-outbound-need), and about sending less of the same message, as I wrote in [why AI SDRs did not fix outbound](https://warmup.ai/blog/why-ai-sdrs-did-not-fix-outbound). We build both sides in [GTM engineering](https://warmup.ai/gtm-engineering). ## What should you try first? Take your current first email and hold it against these rules. Cut the subject line to two or three words. Replace the first line with something true about the reader. Count the characters, and cut until it is under 500. Then rewrite your follow-ups so each one adds something new. If any of them only says "bumping this", delete it. ## Questions, answered ### What is a good subject line for a cold email? Two or three plain words that sound like they came from a person. "Quick question" beats "Q2 Strategy Proposal for Enterprise SaaS Leaders", because the short one looks like a note from someone you know and the long one looks like marketing. Avoid anything that reads like a headline or a campaign name. ### How many follow-ups should a cold email sequence have? As many as you have something new to say. A follow-up that only bumps the thread adds nothing and trains the reader to ignore you. If you can add a useful fact, a fresh idea or a better question each time, the follow-ups earn their place. When you run out of new things to say, stop. ### Should a cold email mention your company at all? Yes, but not first and not for long. Open with the insight about them, and let your company appear in one line of social proof about your impact. The reader should finish the email knowing what you noticed about them before they know much about you.