The anatomy of a B2B cold email

What a cold email is

A cold email is the first email you send to someone who does not know you and did not ask to hear from you. In B2B sales (business to business), it goes from one company to a person at another company: a bookkeeping firm writing to the office manager of a winery, for example. The person you write to is a prospect, a possible customer.

The reader owes you nothing. They get many emails and decide in a few seconds whether to read on. Every part of a good cold email answers one of the reader's silent questions: Who is this? Why me, and why now? What is in it for me? What do you want? How do I get out of this?

Cold email is not treated the same way everywhere. In the United States it is allowed to businesses if you follow some rules. In Germany, advertising by email generally needs the recipient's prior consent, even when the recipient is a business. This guide is about writing; the rules are covered in cold email and the law.

The eight parts

The sizes are a rough illustration for class, not a rule. The opener and the relevance often merge into one sentence, and that is fine.

An annotated example

Fabrikam is a fictional company in the north of England that services forklift trucks. Its account manager, Jonas Brandt, read in the local business news that Tailspin Toys, a fictional toy wholesaler, has opened a second warehouse in Leeds. He writes to the warehouse manager, whose name is on the company's website.

The body is about 100 words and fits on one phone screen. Here is what each part does, and what to watch for when you write your own.

1. Subject line. "Forklift checks for your new Leeds warehouse" names the topic and the reader's situation. Write it the way a colleague would. Never fake an earlier conversation with "Re:" or "Fwd:", and never disguise an offer as an invoice. In the US, the FTC's CAN-SPAM compliance guide says the subject line must accurately reflect the content of the message.

2. Opener. The first sentence is about Tailspin Toys, not about Fabrikam. Many inboxes show this line as preview text next to the subject, so do not spend it on "My name is..." or "I hope this email finds you well".

3. Relevance. The new warehouse is a trigger: a recent, public event that makes the offer relevant now. Other triggers are a job advert, a new regulation or a new manager. Jonas says where he saw the news, so it does not feel like spying. Use only public, business information.

4. Value. Fewer breakdowns at the worst moment. A feature is what a product has ("our technicians carry spare parts"); a benefit is what it does for the customer ("most repairs are done on the first visit"); an outcome is the result in their business ("orders still leave on time in December"). Cold emails work best with benefits and outcomes.

5. Proof. One concrete, true fact about similar customers. No "leading provider", no awards. Name a customer only with their permission. An invented number is not just weak; it is a lie the reader may find out.

6. The ask. The ask, or call to action, is one easy question. "Would a checklist be useful?" costs a one-word reply; "Can we book a 45-minute demo?" asks a stranger for a lot. With two or three asks, the easiest choice is to do nothing.

7. Signature. Name, role, company, postal address and phone, in plain text. Banner images often arrive blocked or as attachments.

8. Opt-out line. One friendly sentence that tells the reader how to stop further emails. Jonas has to keep that promise.

The opt-out line and the law

Some laws ask for an opt-out in some form. An overview, not legal advice:

• United States: CAN-SPAM requires commercial emails, including B2B emails, to explain clearly how to opt out and to include a valid postal address. Opt-outs must be honoured within 10 business days (FTC guide).

• European Union: under the GDPR, Article 21, a person can object to direct marketing at any time, and their data may then no longer be used for it.

• United Kingdom: you must say who you are and give a valid address for opt-out requests, also when you write to companies (ICO guidance).

Length

A rough guide used in these materials: 50 to 125 words for the body. That is about one phone screen, so the reader sees the ask without scrolling. It is not a law of nature, but every sentence has to earn its place. A quick test: if you cannot read it aloud in about 40 seconds, cut it.

Tone

Write as one professional to another: polite, plain and calm. Not grovelling ("I am so sorry to bother you"), not pushy ("You need this").

How formal the greeting is depends on the culture and the industry. "Hi Ayla" is common in the US and the UK; "Dear Ms Demir" is more formal. In German you would write "Sehr geehrte Frau Demir" and use "Sie". When in doubt, be a little more formal.

Plain text or HTML

HTML emails are designed like web pages, with images, colours and buttons, as in a newsletter. Plain text emails contain only words, like a message from a colleague. For a first contact, plain text is usually the better choice:

• It reads like a personal message, not a mass mailing.

• Many mail programs block images from unknown senders until the reader allows them, so a designed email may arrive full of empty boxes.

• Use one link at most, and never a link shortener: hiding where a link goes is what phishing does.

• Send no attachments. People are taught not to open files from strangers. Offer to send the document instead.

Reading on a phone

Many people read work email on a phone first. Keep paragraphs to one to three sentences, put the ask on its own line, and leave out tables, wide images and long signatures. The subject line and the first line carry the decision to read on.

What makes an email feel like spam

Spam filters judge many signals, including the sender's reputation and how readers reacted to earlier emails. More in sender reputation and warm-up.

Worked example: from weak to strong

Here is the same situation, written badly.

Common mistakes

• Starting with yourself. "My name is" and "We are" belong in the signature.

• No "why now". Without a trigger, the email could go to anyone, and the reader notices.

• Fake personalisation. "I love what you are doing" with nothing specific behind it. See the personalisation exercise.

• Several asks. A demo, a forward and a form in one email means none of them happens.

• Invented proof. Numbers you cannot back up destroy trust when they are found out.

• Missing basics. No postal address, no opt-out line, a no-reply sending address.

• Copying a template unchanged. A template gives the order of ideas; the content has to be about this reader.

Check yourself

Practise next: write your own in the cold email writing trainer, or repair one in fix a bad cold email.