Cold email B2B: the complete guide to 2026

In 2026, cold email will still be one of the most profitable channels for B2B prospecting. With a cost per lead 5 to 10 times lower than paid advertising, it offers a ROI that is hard to match · provided you master the basics.

1. build a list of qualified prospects

It all starts with the quality of your list. Use tools such as Apollo, LinkedIn Sales Navigator or Clay to identify decision-makers who match your ICP (Ideal Customer Profile). Each contact must be checked: valid email address, current position, company matching your criteria.

2. Writing emails that convert

A good cold email is less than 120 words long. It starts with a personalised hook (not "Dear Sir"), sets out a problem that the prospect recognises, and proposes a simple action (a 15-minute call). Avoid attachments, multiple links and marketing jargon.

3. Intelligent sequencing

An optimal sequence consists of 4 to 6 emails over 14 to 21 days. The first email is the most important · it opens the conversation. Follow-ups should add value (case studies, statistics, insights) and not simply "follow up".

4. optimise deliverability

In 2026, deliverability has become the No. 1 success factor. Configure SPF, DKIM and DMARC on your sending domains. Use dedicated domains (not your main domain). Warm up your boxes for 2 to 3 weeks before sending. Maintain a stable sending volume.

5. Measure and iterate

KPIs to monitor: open rate (target > 60%), response rate (target > 5%), appointment rate (target > 2%). Systematically test your subject lines, taglines and CTAs. A successful campaign is built up through successive iterations.

Conclusion

B2B cold email is not spam · it's a professionally initiated conversation with a decision-maker who has a problem you can solve. At devlo, we have deployed over 1,000 campaigns using this methodology. The result: thousands of qualified appointments for our customers in Switzerland, Belgium, France and beyond.