Cold email for B2B startups:

Cold email for B2B startups works when you send a short, specific email to a list of the right people, from a domain set up properly, and ask for a call in plain words. It fails when you buy a list, blast a template and paste a booking link into the first message. This guide covers who to email, the rules, what to write and what to count.

The short version

• Agree who you’re emailing before you write a word. A small, approved list beats a big one.
• In the UK you can cold email companies, but treat sole traders and some partnerships as people. In parts of the EU, like Germany, you need consent even for business email.
• Set up separate sending domains and warm them up slowly before the first campaign.
• Keep the first email short, show you looked, and ask for a call without a booking link.
• Count qualified meetings held, not opens.

Start with who, not what

Most cold email that fails was sent to the wrong people. Before writing anything, describe the company you sell to best. Think about size, industry, the tool they use now and the event that makes them need you, like a new hire, a raise or a launch. Then name the person who feels the problem, who may not be the most senior title.

Build a list from that, and have a founder approve it. A list of a few hundred people you’d be glad to talk to is worth more than thousands you’d never call back.

Don’t buy lists. Google’s sender guidelines say it plainly: “Don’t purchase email addresses.” Bought lists carry dead addresses and people who never heard of you, which hurts your sending reputation fast.

The rules, in plain words

This isn’t legal advice. If you’re unsure, check with a lawyer for the countries you’re emailing. Here’s how the rules work in the places early-stage startups email most.

UK

In the UK, marketing email is covered by PECR. The ICO’s guide to electronic mail marketing says you can email any corporate body, meaning a company, Scottish partnership, limited liability partnership or government body, without their consent.

There are limits.

• Sole traders and some partnerships count as individuals. You need their consent first, and the soft opt-in for past customers doesn’t apply to prospects.
• You must say who you are and give a valid way to opt out.
• Honour every opt-out, and keep a “do not email” list so you don’t email them again.
• Named work addresses, like firstname.lastname@company.com, are personal data under UK GDPR. You need a lawful reason to use them, and you should be able to tell people where you got their address.

The ICO notes its guidance is under review following the Data (Use and Access) Act, so check the page before a big campaign.

EU

EU rules come from the ePrivacy Directive, but each country applies it its own way. Some allow business cold email much like the UK. Others don’t.

Germany is the strict example. Section 7 of its unfair competition law, the UWG, treats advertising by email without the addressee’s prior express consent as an unacceptable nuisance. That applies to businesses as well as consumers. In practice, cold email to German companies needs consent first, so use LinkedIn or a warm intro there instead.

Wherever you send, the same basics apply. Say who you are, explain why you’re writing to them, and make it easy to opt out.

Set up sending before you send

Your main domain carries your company’s email, so don’t risk it. Send cold email from separate domains that look like yours, and give each one a few inboxes.

• Set up SPF, DKIM and DMARC on every sending domain.
• Warm the inboxes for two to three weeks before the first campaign, starting with low volume.
• Increase volume slowly. Google’s guidelines say the same.
• Watch your spam rate. Google asks senders to keep it below 0.3% in Postmaster Tools and recommends staying below 0.1%.

For the full setup, work through our cold email deliverability checklist for 2026.

How to write the first email

A good first email reads like one person writing to another. It has four parts.

1. One line that shows you looked at them. A real detail, like a job post, a launch or something they wrote.
2. The problem, in their words. What it costs them, not what your product does.
3. What you do, in one sentence.
4. A small, clear ask.

Keep it short enough to read on a phone without scrolling. Plain text, no images and no attachments. To check a draft against these rules, paste it into our free cold email checker.

Ask for a call, but leave the link out

Ask for a call in the first email. Say it in plain words, like “Worth a 15-minute call next week?” A clear ask gets clearer answers than “Let me know your thoughts.”

Don’t put a booking link in that first email. Links in a first message from a domain nobody knows can hurt deliverability. A calendar link also asks a stranger to do the work of booking before they’ve said yes. A reply is easier to give, and it starts a conversation.

When they reply, send the link, or offer two times and let them pick.

Here’s the shape. Rewrite it in your own words for every segment.

Subject: your SDR hiring post

Hi Sam, saw you’re hiring two SDRs to cover the US. Before they can book meetings, someone has to build the list and get the emails landing.

We set up and run outbound for B2B startups, from the list to the meetings.

Worth a 15-minute call next week?

Follow-ups

Busy people miss first emails, so plan two or three follow-ups. Each one should add something new, like a short example, a useful point or a different angle on the problem. “Just bumping this” adds nothing.

Space them a few days apart, and stop when someone says no or opts out.

Test sequences side by side

Don’t bet the list on one email. Split the list and send two or three versions at once, changing one thing each time, such as the opening line, the problem you lead with or the ask. Keep the winner and test a new version against it.

What to count

Google’s guidelines note that Google doesn’t track open rates, and opens are unreliable anyway. Count things that mean something.

• Replies, and positive replies.
• Meetings booked.
• Qualified meetings held. That means the meeting happened, with someone on your approved list, for at least 15 minutes.
• Opt-outs and spam complaints, so you catch problems early.

Add LinkedIn

Cold email works better next to LinkedIn. Connect with the same people, and have a founder post about the problem you solve every week. When your email lands, your name is already familiar. For countries where cold email needs consent, LinkedIn may be your main channel.

When to run it yourself, and when to get help

Founders should send the first batches themselves. You’ll learn which problems people care about and how they describe them. Once you know what gets replies, it’s worth handing the setup and the daily running to someone else, so you can spend your time on the calls. If you’ve just raised and want a fuller plan, read how to run outbound after raising. If you haven’t won your first customers yet, start with our guide on how to get your first B2B customers.

FAQ

Is cold email legal for B2B in the UK?

Yes, to corporate bodies like limited companies and LLPs, as long as you say who you are and give an opt-out. Sole traders and some partnerships need consent first. Check the ICO’s guidance, which is under review.

Can I cold email businesses in Germany?

Germany’s UWG requires prior express consent for advertising email, including to businesses. Use LinkedIn, events or warm intros instead.

Should I put a booking link in my first cold email?

No. Ask for a call in plain words, and send the link once they reply.

How many follow-ups should I send?

Two or three, each adding something new. Stop when someone says no.

How long should a cold email be?

Short enough to read on a phone without scrolling. One line that shows you looked, the problem, what you do and the ask.

Want buyers to find you first?

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