How to write a cold email: anatomy, rewrites and a checklist
How to write a cold email that gets replies: each part built step by step, four weak emails rewritten, length guidance and a checklist to run before you send.
To write a cold email, open with the reason you’re writing to this particular person, say in one or two sentences what you offer and why it matters to them, and end with one question they can answer in a sentence. Keep it short enough to read on a phone without scrolling, write it in plain text, and give it a subject line about them rather than you. Then follow up in the same thread if they don’t reply.
That’s the whole method. The rest of this guide shows how to do each part well. We build one email from scratch, part by part, then rewrite four weak cold emails and explain every change. At the end there’s guidance on length and a checklist to run before you send. If you’d rather start from finished templates, our cold email templates page has 16, grouped by goal.
Counts only, no score. The notes are our rules of thumb from this guide, not hard limits.
The anatomy of a cold email
Every cold email has the same five parts, and the reader meets them in this order. Each part has one job: get the reader to the next part.
- Subject lineThree to six words about them, not you. Decides whether the email gets opened.
- First lineWhy you're writing to this person. Shows in the inbox preview, so it decides whether they keep reading.
- Why youOne or two sentences: what you do and why it's relevant to them. Proof if you have it.
- The askOne question they can answer in a sentence.
- Sign-offName, role, company, address. Plain text, no banners.
To make this concrete, we’ll build one email. The sender runs a small content agency that writes for B2B software companies. The recipient, Marta, is head of marketing at Plotline (a made-up project management tool). Plotline’s blog published every week until five months ago, then stopped.
1. The subject line
The subject line has one job: get the email opened by the right person. In a cold email, it also tells the reader whether the message was written for them.
First draft: “Content marketing services”. It’s about the sender and could go to anyone. Marta would read it as a newsletter.
Better: “Plotline’s blog”. Short, specific and about something she owns. It creates a small question (what about it?) without being a trick.
Keep subject lines to roughly three to six words, in sentence case or lowercase, and make sure the email delivers what the subject promises. Misleading subject lines, including fake “Re:” prefixes, are prohibited for commercial email in the US under CAN-SPAM.
2. The first line
Most mail apps show the first line or two next to the subject in the inbox list. So the first line is really part of the subject: it decides whether Marta opens the email, not only whether she keeps reading.
First draft: “Hi Marta, I hope this email finds you well. My name is Sam and I run Northcopy, a content agency.” Nothing here is about her. Her name is in the greeting, and his name is already in the From line.
Better: “Hi Marta, Plotline’s blog had a new post every Tuesday until May, and the guide to sprint retros still shows up when I search for it.”
That line proves he looked, mentions something specific, and starts with her. It also contains a compliment that’s believable because it’s a fact (the post ranks), not an adjective.
3. Why you
Now he has a sentence or two to say what he does and why it’s relevant to Marta. This is where most cold emails go wrong, because the writer tries to fit in everything.
First draft: “We’re a full-service content agency offering blog posts, ebooks, case studies, social media, newsletters and SEO audits for companies of all sizes.” A list of services is a brochure. She can’t tell which part applies to her.
Better: “We write for B2B software teams who’ve lost their in-house writer, usually two posts a week in the team’s existing voice. Our work for Taskgrid’s blog is here: [link].”
One sentence says who it’s for and what it is. One sentence gives proof. The link is the only link in the email, and it’s the one she’d want. Proof should always be real: a client you’re allowed to name, a published piece, a result you can show. If you don’t have proof yet, leave that sentence out rather than inventing a case study.
4. The ask
The ask is a question. It should be small, specific and answerable in one sentence.
First draft: “Would you be available for a 30-minute discovery call next week to discuss your content strategy? Here’s my calendar link.” That’s a big commitment from a stranger, and it skips the question she has to answer first: is this even relevant?
Better: “Is the blog paused on purpose, or is it something you’d like to restart?”
Either answer is useful. “On purpose” ends the conversation politely, and saves him a follow-up sequence. “We’d like to restart” opens it. A question like this gets replies because it’s about her situation, not his calendar.
5. The sign-off
Keep it plain: name, role, company, website and a physical address. No banner images, no quotes, no list of social links. In the US, a physical postal address and a way to opt out are required in commercial email; in a one-to-one email, a line such as “If it’s not relevant, just say so and I won’t follow up” does the opt-out job in plain language.
The finished email
Subject: Plotline’s blog
Hi Marta,
Plotline’s blog had a new post every Tuesday until May, and the guide to sprint retros still shows up when I search for it.
We write for B2B software teams who’ve lost their in-house writer, usually two posts a week in the team’s existing voice. Our work for Taskgrid’s blog is here: [link].
Is the blog paused on purpose, or is it something you’d like to restart?
Sam Ortega Founder, Northcopy northcopy.example · 12 Harbour Street, Leeds If it’s not relevant, just say so and I won’t follow up.
About 80 words in the body. Every sentence is about Marta’s blog or directly relevant to it, and there is exactly one thing for her to do.
Four weak cold emails, rewritten
Here are four cold emails of the kind people send every day. Each has a common problem. We rewrote each one and explained what changed. All four are examples we wrote; the names and companies are made up.
Rewrite 1: the sales email that’s all about the sender
Before
Subject: Introducing DataNest, the leading analytics platform
Hi Chris,
My name is Alex and I’m an account executive at DataNest. DataNest is an innovative, AI-powered analytics platform that helps businesses of all sizes unlock insights from their data. We work with hundreds of companies across many industries and have won several awards.
I’d love to set up a time to show you a demo of how DataNest can transform your business. Are you free for 30 minutes this week?
Best, Alex
What’s wrong: six sentences about DataNest, none about Chris. “Leading”, “innovative” and “transform” are claims the reader can’t check. The ask is a demo before Chris knows whether he has the problem.
After
Subject: reporting at Fernway
Hi Chris,
Fernway is hiring two data analysts, and both job ads mention building weekly reports in spreadsheets.
DataNest connects to your warehouse and builds those reports automatically, so analysts spend their time on questions instead of copy-paste. Corvel’s ops team moved their weekly reports over in a fortnight.
Are the weekly reports something you’re trying to automate, or is that not a priority?
Alex Brandt, DataNest
What changed: the opener is a fact about Fernway (job ads are public and specific). One sentence says what the product does for this situation. The proof is a named customer (it would have to be real). The ask checks fit instead of booking a demo.
Rewrite 2: the flattering link building pitch
Before
Subject: Collaboration opportunity!!
Hi there,
I came across your amazing website and really loved your content. You’re doing a great job!
I recently wrote an in-depth, comprehensive article on email marketing that I think your readers would find valuable. Would you consider adding a link to it on one of your pages?
Looking forward to hearing from you!
What’s wrong: no name, no page, no reason. “Amazing website” with nothing specific reads as a template, because it is. The editor would have to go looking for where the link could go, which they won’t do.
After
Subject: your list of email deliverability tools
Hi Dana,
Your post “Email tools we actually use” links to MailCheckr in the deliverability section, but that site now redirects to a domain parking page.
We keep a guide to checking SPF, DKIM and DMARC records that covers the same ground: [link]. Happy if you use it as a replacement, or if you’d rather point to something else.
Thought you’d want to know about the broken link either way.
Jo
What changed: it’s addressed to a person and names a specific page and a specific problem. The email is useful even if Dana doesn’t use the link. Exclamation marks and “collaboration opportunity” are gone. Our link building outreach tools guide covers finding pages like this at scale.
Rewrite 3: the email with five asks
Before
Subject: Quick question + resources
Hi Priya,
I wanted to reach out because we help agencies with reporting. Here’s our website, our case studies page and a short video. We also have a free trial and a webinar next Thursday you might like.
Would you be open to a call? Or if it’s easier, you can book directly on my calendar, or reply with the best person to talk to. Also happy to send a proposal.
Thanks!
What’s wrong: five links and four different asks. When a cold email offers that many options, the easiest response is none of them. Several links also make an email look like marketing to spam filters, one of the habits in our email deliverability best practices checklist.
After
Subject: client reports at Bright Harbour
Hi Priya,
Bright Harbour’s case studies mention monthly reports for each of your 40 retainer clients. That’s a lot of screenshots.
We build those reports automatically from Google Ads and GA4, in the agency’s own branding.
Who at Bright Harbour puts the monthly reports together?
Ravi
What changed: one fact about her agency, one sentence on the offer, no links, one question. The question asks for a name, which is easy to answer even if she’s the wrong person.
Rewrite 4: the PR pitch that buries the story
Before
Subject: Press release: Coastline Insurance announces new survey
Dear Editor,
Coastline Insurance, founded in 1998 and headquartered in Bristol, is one of the region’s leading providers of home and business insurance. As part of our ongoing commitment to customer education, we recently conducted a survey. Please find the press release attached.
Kind regards, The Coastline PR Team
What’s wrong: “Dear Editor” means nobody checked who covers this. The story (whatever the survey found) isn’t in the email at all; it’s in an attachment from a stranger, which many people won’t open.
After
Subject: {{headline_finding}}
Hi Tom,
You wrote about flood cover for small businesses in March, so this may be useful: {{one_sentence_finding}}.
It’s from a survey of {{sample_size}} small business owners in {{region}}, run by {{research_firm}} in {{month}}. Full results and method: [link].
I can share the raw data or set up a call with our head of claims.
Mel Carter, Coastline Insurance
What changed: it’s addressed to a reporter who covers the topic. The finding is in the subject line and the first sentence. The method is stated, because a careful journalist will ask. We left the numbers as merge tags on purpose: only use figures from research you actually ran.
How long should a cold email be?
There’s no single right length, but there’s a good way to reason about it. A cold email is read by someone who didn’t ask for it, often on a phone, often between other tasks. They will give it a few seconds to decide whether it’s worth more. So the email should make its point before they’d need to scroll, and each sentence should earn its place.
For most cold emails that works out at about 50 to 125 words in the body. Shorter is fine when the ask is small. Longer is fine when the email has to carry something the reader needs to see in the email itself, such as a quote for a journalist or a working title for an editor.
| Feature | Typical length | Why |
|---|---|---|
| Asking for the right person | 30-60 words | A favour; the shorter, the easier |
| Link request or unlinked mention | 40-80 words | One page, one reason, one ask |
| B2B sales intro | 50-125 words | Reason, offer, proof, question |
| Guest post pitch | 80-150 words | Needs a working title, points and samples |
| PR pitch with a quote | 100-180 words | The quote is the content; it can't be a link |
Two things push emails longer than they should be. The first is trying to answer every objection up front. You don’t need to: if they’re interested, they’ll ask, and that’s a reply. The second is listing everything you do. Pick the one thing that’s relevant to this recipient and leave the rest for the conversation.
Length also matters for follow-ups. A follow-up should usually be shorter than the first email, add one new thing and make the ask easier. Our cold email follow-up guide covers timing and wording, and there are examples in follow-up email after no response.
Self-review checklist before you send
Run through this before every batch, with the merge tags filled in, reading the email as the recipient would.
Subject line
- Is it about them, not you?
- Is it under about six words?
- Does the email deliver what the subject suggests? No fake “Re:” or “Fwd:”.
First line
- Does it say why you’re writing to this person, specifically?
- Would it still make sense if they knew 200 other people got the same email? If not, what gives it away?
- Did you check the fact it’s based on?
Body
- Is there one offer, described in one or two sentences?
- Is every claim true and checkable? Any proof refers to a real customer or result.
- Have you cut adjectives like “leading”, “innovative” and “best-in-class”?
- At most one link, no attachments, no images.
Ask
- Is there exactly one question?
- Can they answer it in one sentence?
- Is the step small enough for a stranger to say yes to?
Sign-off and compliance
- Your name, role and company, plus a physical address.
- A plain way to opt out, and a list where opted-out people won’t be emailed again.
- You’re allowed to email this person where they are (see the legal section below).
Before the batch
- Read three or four filled-in emails in full. Look for empty merge tags, odd capitalisation and company names with legal suffixes.
- Fallbacks are set for missing fields (“Hi there” rather than “Hi ,”).
- The send is paced, with a daily cap per mailbox. Google’s limits are about 500 a day for consumer Gmail and 2,000 for Workspace, and cold outreach should stay well below them.
If you send to more than a few dozen people a week, a tool that handles pacing, merge-tag checks and follow-ups saves a lot of manual work; our cold email software guide compares the options.
Common questions about cold email rules
What does the 3-21-0 email rule mean?
The 3-21-0 rule isn’t a cold email rule. It’s an inbox habit: process your email 3 times a day, for 21 minutes each time, aiming for 0 emails left. Ben Meer describes it in his System Sunday newsletter and credits author Kevin Kruse with it. It’s useful for keeping on top of replies once your outreach is running, but it says nothing about how to write or time a cold email. For timing, see our cold email follow-up guide.
Is cold emailing illegal?
Cold email is legal in many places, with conditions. In the US, the CAN-SPAM Act applies to commercial email, including B2B. You must identify yourself, avoid misleading headers and subject lines, include a valid physical postal address, offer a way to opt out and honour opt-outs promptly.
In the EU and UK the rules depend on the country. Some allow cold email to business addresses under legitimate interest, as long as the message is relevant to the recipient’s role and opting out is easy. Others, Germany among them, generally require prior consent even for B2B. Emailing consumers cold is far more restricted almost everywhere. Check the rules where your recipients are, not only where you are.
For more on the basics, see our cold email guide and cold email outreach for planning a full campaign.
Questions people ask
What is a good format for a cold email?
A short subject line about the recipient, a first line that shows why you're writing to them, one or two sentences on what you offer and why it's relevant, one question as the ask, and a plain signature with your name, company and address. Plain text, no images, at most one link.
What does the 3-21-0 email rule mean?
It's an inbox habit, not a cold email rule: process email 3 times a day, 21 minutes each time, aiming for 0 left. Ben Meer describes it and credits author Kevin Kruse. It helps you keep up with replies, but it doesn't tell you how to write a cold email.
Is cold emailing illegal?
Not in the US, where B2B cold email is legal under CAN-SPAM if you identify yourself, use honest subject lines, include a physical address and honour opt-outs. In the EU and UK it depends on the country: some allow B2B cold email under legitimate interest, others such as Germany generally require prior consent, and emailing consumers cold is far more restricted.
How long should a cold email be?
Short enough to read on a phone without scrolling: for most cold emails that's about 50 to 125 words. A pitch that needs a sample or a quote can run longer, as long as every sentence is there for the reader.
How do you start a cold email?
With the reason you're writing to this person: something they made, something that happened at their company or something you checked. Skip "My name is" and "I hope this email finds you well"; your name is already in the From line.
How do you end a cold email?
With one question they can answer in a sentence, then your name, title, company and contact details. Avoid ending with several options or a calendar link as the only way to respond.
Should I follow up if a cold email gets no reply?
Yes, two or three times in the same thread, a few days apart, each time adding something new or making the ask easier. Stop as soon as they reply, and never email again after someone asks you to stop.