Cold email is an email sent to someone you have never contacted before, usually to start a business conversation. "Cold" means there is no prior relationship: the person did not sign up, buy from you or ask to hear from you.
It is the written version of a cold call, with one big difference: the reader answers in their own time, or not at all. This page covers what cold email means, how it differs from spam and email marketing, and whether it still works. For how to run it, see our guide to cold email for agencies.
What is cold email?
Cold email means a first message to someone who has not invited it, with the aim of getting a reply. The term covers the message and the practice: a cold email is one message, and cold emailing is the work of sending them.
A typical cold email has four features:
- One recipient. It is addressed to a person by name, not to a list.
- Plain text. No designed template, no images, usually no links.
- A relevant reason. It mentions something specific about the recipient's business.
- An easy exit. The recipient can say no or ask not to be contacted again.
Here is an invented example from an SEO agency to a plumbing business:
Subject: mesa listing
Hi Dana, saw Rivera Plumbing opened a second location in Mesa last month. Your Google listing still only shows the Phoenix address, so people searching in Mesa may not find you.
We set up local listings for trades businesses across Arizona.
Worth a quick look at how yours could show up in Mesa?
Sam
When businesses send cold email to many prospects, they do it as a campaign: the same structure, a personal first line for each prospect, and a few follow-ups over two weeks.
What does cold email mean in sales?
In sales, cold email means prospecting by email: contacting businesses that fit your ideal customer and asking whether they have a problem you solve. It sits at the top of the sales process, before any call or meeting.
Common uses include:
- Agencies finding new clients, such as an SEO agency writing to local trades.
- B2B services such as accountants, recruiters and IT firms reaching business owners.
- Software companies booking demos with a specific job title.
- Partnerships such as proposing a referral deal or co-marketing.
People also use "cold email" for job hunting and networking. The principles are the same, but this page is about business-to-business sales.
What is the difference between cold email and spam?
Cold email is relevant, honest and sent to one person at a time. Spam is bulk, irrelevant and often deceptive. The difference is in who receives it, what it says and how it behaves when someone says no.
| Cold email | Spam | |
|---|---|---|
| Recipients | Chosen businesses that fit a profile | Anyone on a bought or scraped list |
| Message | Written about the recipient's business | The same pitch for everyone |
| Sender | Real name, real business, real address | Hidden or fake |
| Subject line | Honest | Often misleading |
| Opt-out | Honored straight away | Ignored |
| Volume | Dozens per mailbox per day | Thousands at once |
Inbox providers draw a similar line. A cold email that is well targeted and rarely reported is far more likely to reach the inbox; one that looks like bulk mail gets filtered. Our cold email deliverability guide explains the rules they use. Pipefire keeps each mailbox at cold email volumes and pauses a campaign or mailbox whose numbers slip, so one bad week does not drag down the rest.
Cold email vs email marketing vs warm email
Cold email reaches strangers who fit your profile. Email marketing reaches subscribers who opted in, and warm email reaches people who already know you. Each one needs different tools and follows different rules.
| Cold email | Email marketing | Warm email | |
|---|---|---|---|
| Recipient | A stranger who fits your profile | A subscriber who opted in | Someone you have met or spoken to |
| Format | Plain text, one person | Designed newsletter, a list | Plain text, one person |
| Sent from | Separate sending domains and mailboxes | A platform such as Mailchimp or Klaviyo | Your normal mailbox |
| Goal | A first reply | Repeat sales and engagement | Moving a relationship forward |
| Volume per mailbox | About 30 a day | Thousands per send | Whatever you need |
Never send cold email through an email marketing platform. Their terms require opted-in lists, and accounts that send to cold lists get closed. Mailchimp's acceptable use policy, for example, bans purchased and publicly available lists.
What is cold outreach?
Cold outreach is any first contact with a prospect you have no relationship with: cold email, cold calls and LinkedIn messages. Cold email is the channel most businesses start with, because one person can run hundreds of conversations a week.
The channels work best together. A common pattern is a cold email first, a LinkedIn connection a few days later, and a call only to people who opened the conversation. Whichever you use, the same rule applies: be relevant to the person, or do not contact them.
Is cold email marketing legal?
Cold email is legal in the United States if you follow the CAN-SPAM Act. That means honest sender details and subject lines, a clear sign that the message is an ad, a physical postal address, and an opt-out you honor within 10 business days. Penalties reach $53,088 per email, according to the FTC's CAN-SPAM compliance guide.
The UK and the EU are stricter. In the UK, business-to-business cold email to company addresses is allowed with a clear opt-out, but sole traders and some partnerships are treated like private individuals and need consent, according to the ICO's email marketing guidance. In the EU, it depends on each country's rules and on having a legitimate interest. Our main guide covers cold email law in the US, UK and EU in more detail.
This is a summary, not legal advice. Check the current rules in any country you plan to email before you send.
Does cold email work?
Cold email works when it is relevant and well set up, and fails when it is sent in bulk. The gap between good and average senders is large.
Gong analyzed more than 28 million cold emails in its cold email research. Top sales reps booked 8.1 times as many meetings as average reps, and the average rep sent 344 cold emails to land one meeting. The difference comes from targeting, short emails about the prospect's problem, and not pitching.
The setup matters as much as the writing. Emails from a new domain with no warm-up, or to an unverified list, land in spam whatever they say.
What does a cold email campaign involve?
A cold email campaign involves six parts: separate sending domains, several mailboxes, DNS authentication, about two weeks of warm-up, a verified list of prospects, and a short sequence of emails. Most of the work is in the first five, which is why many businesses either build it themselves or hand it to a done-for-you cold email platform.
- Sending domains that are separate from your main business domain.
- Mailboxes on those domains, about 2 per domain.
- Authentication: SPF, DKIM and DMARC records on every domain.
- Warm-up for at least 14 days before any cold email.
- A prospect list of named people at businesses that fit, with every address verified.
- A sequence of 3 or 4 short emails over two weeks. Our guide to writing a cold email covers the structure.
Cold email FAQ
What is a cold email example?
A short note to a business owner that mentions something specific, such as a new location, names one problem they likely have, gives one line of proof and asks a yes or no question. It is plain text and under about 125 words.
Why is it called cold email?
It is called cold because there is no existing relationship, the same way a cold call is a call to someone who is not expecting it. A warm email goes to someone who already knows you.
Is cold emailing the same as cold calling?
Both start a conversation with a stranger. Cold email lets the prospect reply in their own time and lets one person reach far more prospects a week, while a call gets a faster yes or no.
Is cold email effective for small businesses?
Yes, for businesses that sell to other businesses and can name the type of customer they want. It is a poor fit for selling to consumers, where privacy rules are stricter and lists are harder to build.