Cold email: how to write prospecting emails that convert

What is a cold email (and why it works)

You've probably already received an email from a stranger proposing something. If the message was generic and off-topic, you deleted it. But if by chance it hit the mark (right timing, right subject) you may have replied. That's exactly the principle of cold email.

A cold email is a professional message sent to someone who doesn't know you yet. It's not spam: it's a targeted and personalized message, sent to a person who could need your services. And in 2026, it remains the only channel that lets you reach a decision-maker directly, without algorithms or intermediaries.

In most countries, B2B cold email is legal as long as you follow certain rules (more on that below). Always check local regulations before launching campaigns.

The anatomy of a perfect cold email

A good cold email consists of 5 elements, each with a specific role.

1. The subject line: the gateway

The subject line determines whether your email will be opened or ignored. It should be short (5 to 8 words), intriguing, and not look like a marketing email.

• "Quick question about [company]": simple and direct
• "[First name], an idea for [problem]": personalized
• "Following your post on [topic]": contextual

2. The hook: the first 2 lines

The hook must show you've done your homework. Mention something specific about the company or the person: a recent article, a piece of news, a project, a funding round.

Example: "I saw you opened a second restaurant in Lyon last month. Congratulations! It gave me an idea."

What you should never write: "I'm reaching out because..." or "Our company specializes in..." Nobody reads past that.

3. The value proposition: one sentence is enough

Explain in a single sentence what you can bring. Not what you do, but what the company gains.

Bad: "We are a digital marketing agency specializing in SEO." Good: "I help restaurants fill their tables on weekdays through local search optimization."

The difference? The first talks about you. The second talks about the result for the prospect.

4. Social proof (optional but effective)

If you have a number or a concrete example, slip it in. "I did the same thing for [similar company] who increased their bookings by 40% in 3 months."

No social proof? No problem. It's better to leave it out than to make something up.

5. The call to action: simple and low-commitment

End with a simple question that requires little effort:

• "Is this worth 15 minutes of your time this week?"
• "Is this something you're thinking about right now?"
• "Who would be the right person to talk to about this at your company?"

Ready-to-use cold email template

Here's a template you can adapt to your business:

---

Subject: Quick question about [company name]

Hi [First name],

[Personalized hook: 1 sentence about the company or person]

I work with [type of company] like [example] to [concrete result]. [Optional social proof in 1 sentence.]

Is this something you're thinking about right now?

[Your first name]

---

This template is under 80 words. That's intentional. Short emails have a reply rate 2 to 3 times higher than long emails.

Follow-ups: where the results hide

50% of positive replies come from follow-up emails, not the first email. Yet most people never send a follow-up.

A good sequence includes 2 to 3 follow-ups:

• Follow-up 1 (D+3): bring a new angle or additional information
• Follow-up 2 (D+7): share a client case or relevant content
• Follow-up 3 (D+12): the "break-up" email. Short and direct, leave the door open

Legal rules for cold email

In France, B2B cold email is legal. In most countries, similar rules apply for B2B outreach. Here are the general principles:

• You can only send commercial emails to professional addresses (no personal @gmail.com)
• The recipient must be able to unsubscribe easily (mandatory unsubscribe link)
• You must clearly identify yourself (name, company)
• Data must be collected lawfully (public data, directories, websites)

Mistakes that kill your reply rates

If your emails go unanswered, check that you're not making one of these mistakes:

• Your first sentence talks about you instead of the prospect. Flip the logic
• The same message goes to everyone. Personalization is not optional in 2026
• Your emails exceed 100 words. Beyond that, reply rates drop
• You include attachments: they trigger spam filters
• 200 emails sent at once on day one. Ramp up volume gradually to avoid burning your domain
• Addresses aren't verified before sending. A bounce rate above 5% can get you blocked

How to save time with the right tools

Writing personalized cold emails for dozens of companies takes time. A lot of time. It's the most time-consuming part of prospecting.

Automated prospecting tools (Reavo is one of them) speed up the three longest steps:

1. Finding companies: you describe your target and receive a qualified list in seconds. 2. Retrieving contacts: verified emails, phone numbers, names of key people. 3. Writing messages: a unique email is generated for each company, adapted to your tone.

You keep control over sending and follow-up. Preparation time goes from 3 hours to about fifteen minutes.

Conclusion

A good cold email is 80 words that show you understand your prospect's problem. No need for literature, no need for jargon. Just a clear message, addressed to the right person, at the right time.

The real work isn't in writing the first email. It's in the follow-up, the tracking, and the continuous adjustment of your approach. Those who treat cold email as an iterative process (test, measure, adjust) always end up finding the formula that works for them.