DEVLO.CH — SWISS B2B AGENCY
Cold Email B2B: personalised sequences with 70%+ open rate
Infrastructure, copywriting and execution focused on qualified responses.
B2B cold email **is a direct outreach method** that involves contacting business prospects who don't yet know you, with personalised messages designed to trigger a response. Well-executed, it produces high open rates and concrete sales conversations.
devlo masters the entire chain: sending infrastructure (secondary domains, SPF/DKIM/DMARC, progressive warm-up), value-oriented copywriting, sequences of 3 to 5 emails, and systematic A/B testing. We use lemlist as the basis for execution, combined with Clay for personalisation at scale.
An effective cold email is not a mass mailing. Each message must seem written for its recipient · and that's what we build, based on reliable data and a relevant business angle.
What this service covers
- ✓Audit of existing email infrastructure
- ✓Setup secondary domains, SPF, DKIM, DMARC
- ✓Progressive warm-up of outboxes
- ✓ICP definition and generation of qualified lists
- ✓Drafting of 3 to 5 emails
- ✓Customised Icebreakers (manual or via Clay)
- ✓A/B tests on objects, hooks and CTAs
- ✓Segmentation by market, language and industry
- ✓Response management and qualification
- ✓Deliverability reporting, response, interest and appointments
5-step cold email process
- 1
Audit
Reputation check, DNS and spam risks.
- 2
Setup
Setting up the infrastructure and controlled warm-up.
- 3
Targeting
Building ICP lists and personalising messages.
- 4
Launch
Sequencing and continuous A/B testing.
- 5
Qualification
Inbox processing, reminders and appointment booking.
By Charles Perret, Founder, devloWhy are deliverability and messaging the two critical levers in cold email?
Without deliverability, even an excellent message is never read. Without a relevant message, even good deliverability will not convert. According to Gartner, over 20% of B2B cold emails never reach the primary inbox when DNS authentication is misconfigured. Our method treats both dimensions together: technical infrastructure and commercial copywriting.
Moreover, we systematically protect your primary domain by using secondary sending domains. This is a structuring rule to avoid any impact on your transactional emails and your overall reputation. The combination of proper SPF/DKIM/DMARC setup with value-oriented messaging is what separates high-performing campaigns from those that stall.
In summary:
Key takeaways
- Deliverability and messaging must be treated as equally important pillars
- Always use secondary sending domains to protect your corporate domain reputation
- Proper SPF, DKIM, and DMARC configuration is non-negotiable for inbox placement
- A/B testing on subject lines, hooks, and CTAs drives continuous improvement
Examples of email performance
Step 1/2 — Configure
50%
Configuring your cold email campaign
Indicate your current maturity to frame the execution strategy.
Existing email infrastructure
Monthly dispatch volume
Current tool
Level of customisation
Main problem
Target sector
Configuration preview
Existing email infrastructure: Not defined
Monthly dispatch volume: Not defined
Current tool: Not defined
Level of customisation: Not defined
Main problem: Not defined
Target sector: Not defined
You can edit your choices before submission.
Step 2/2 — Contact details
100%
Step 2 — Get the plan
Review your configuration then submit your contact details.
Selected summary
Existing email infrastructure: Not defined
Monthly dispatch volume: Not defined
Current tool: Not defined
Level of customisation: Not defined
Main problem: Not defined
Target sector: Not defined
Thank you for reaching out. We will get back to you within 24 hours.
Case studies
Field proof for this service
Discover real campaigns delivered by devlo in Switzerland, Belgium, France and DACH. Each case study shows results, the method used, and operational learnings.
120 qualified appointments
·7,000 decision-makers targeted
·96-99% deliverability
·Virtually no show
Monizze
Belgium
200,000 turnover signed
·80+ appointments
·45 new customers
·60% conversion demo→client
Horus Software
Belgium
54 meetings in the DACH region
·71% open
·29% click-through
·516 prospects contacted
CareerLunch
DACH
45% response rate
·73% open
·14 qualified appointments
·Contracts signed
Cegos
German-speaking Switzerland
70 qualified appointments
·UEFA, TAG Heuer, Rothschild
·40% response rate
·13% interest
APIDAE
French-speaking Switzerland
16 qualified appointments
·89% open
·69% response rate
·6% of meetings
Lemanvisio
Switzerland
11 qualified tenants
·87% open
·73% response rate
·9 days before 1st appointment
HIAG
Switzerland
FAQ cold email B2B
What deliverability can we aim for?
With a correctly configured infrastructure, we generally observe 96 to 99% deliverability on active campaigns.
With a correctly configured infrastructure, we generally observe 96 to 99% deliverability on active campaigns.
How many emails do you need per sequence?
The majority of successful campaigns are between 3 and 5 emails over two to three weeks, with complementary follow-up angles.
The majority of successful campaigns are between 3 and 5 emails over two to three weeks, with complementary follow-up angles.
Can you use your main domain?
No, we recommend secondary domains dedicated to cold email to protect the reputation of your main domain.
No, we recommend secondary domains dedicated to cold email to protect the reputation of your main domain.
What's the difference with email marketing?
Email marketing targets an opt-in base.
Email marketing targets an opt-in base. Cold email is B2B prospecting targeted at non-committed professionals, with very different rules for execution.
New at devlo
Also discover AI Sales Ops, our AI automation layer for B2B sales teams
If you want to complement this service with AI workflows for inbox management, CRM updates, meeting preparation, reporting or battle cards, we can deploy them alongside your outbound engine.
Related services
Expand cold email with complementary levers
Speed up your responses in the coming weeks
Configure your campaign and receive a precise delivery, targeting and copywriting plan.