B2B prospecting from the French company register

Name your customer. It finds them, writes to each one, and reads the replies.

Tell Mailbase who you sell to. It pulls every matching company from the register, finds and verifies the email on their own site, writes one email per person from a real fact, and sends a few a day. Every reply lands in an inbox sorted by intent. Nothing leaves without your approval.

Start finding customers See how it runs

Free to start, no card
Every company in France
Emails verified before anyone writes
You approve every email

Version française →

IllustrationThe counts come from one measured run. Names, companies and messages are fictional examples.

Any trade, anywhere in France

Plumbers · Gironde
Bakeries · Lyon
Architects · Nantes
Electricians · Saône-et-Loire
Roofers · Finistère
Accountants · Lille
Florists · Marseille
Garages · Toulouse
Web agencies · Paris
Carpenters · Bas-Rhin
Opticians · Montpellier
Landscapers · Loire-Atlantique

01How it runs

Four steps. Real numbers from one run.

Electricians in Saône-et-Loire, 1 to 9 staff, on a public register. Nothing below is a projection.

Finds the companies

companies found

Every match in the French register — activity, place, size, age — deduplicated on its SIREN. Head office in your area, not a chain with a branch there.

Finds who to write to

emails verified

Website, then the legal notice: the email that is read and the owner’s name. A site that belongs to someone else is rejected on its SIREN.

Writes one email each

per email written

From a real fact about them, in your voice, ending on your ask. Under 120 words. You approve every one until you switch to auto.

Sends a few a day

sent without your approval

Your daily cap, your hours, one or two follow-ups. A reply or a bounce stops the sequence for that company.

02Product tour

The whole loop, in one window.

Click through the screens you will actually use. The counts are the run above; the names and messages are examples.

mailbase.studio/app/find

Electricians · Saône-et-Loire · 1 to 9 staff

43.21A · department 71 · bands 01–03

Running

145in the register

15sites confirmed

13emails found

13verified

Company	Contact	Email	Stage
Marlot ÉlectricitéMâcon	Claire Marlot	verified	Replied · hot
Vasseur InstallationsChalon-sur-Saône	Julien Vasseur	verified	Replied · warm
Roubaud & FilsAutun	Hélène Roubaud	verified	Replied · objection
Girel ÉnergieLouhans	Thomas Girel	verified	Out of office

One measured run on a public register, no paid data.

IllustrationFictional names, companies and messages. The counts come from the measured run.

03One afternoon, measured

Electricians in Saône-et-Loire, 1 to 9 staff — one afternoon, no paid data.

What the engine did on a public register with website lookup by name only. A search provider raises the site and email rates; nothing here is projected.

Registerevery active match, deduplicated on its SIREN
Websiteproven by SIREN or name and town on the page
Legal noticethe email read on their own site
Mail servereach address checked before anyone writes
Draft2 s per email, from a real fact, in French

145companies found

15websites confirmed

13emails verified

5wrong sites rejected

04Safety

Built so you can’t burn your domain.

The guardrails are on by default. Cold email goes wrong quietly; these stop it early.

You approve the first batch

Auto-sending unlocks only after you have reviewed drafts yourself.

Daily cap and sending hours

A few emails a day, inside the hours you set, follow-ups spaced out.

A kill-switch on bounces and complaints

Sending pauses on the provider’s own thresholds, measured over the window complaints actually arrive in.

Never contacts twice

Clients, competitors and past contacts are blocked by company, domain or address. A reply or a bounce ends the sequence.

Suppression and one-click unsubscribe

List-Unsubscribe headers on every send, a suppression list shared across campaigns, contacts updated from bounce and complaint webhooks.

Screened before it leaves

Every draft is checked for the patterns that get a domain blocked before it can be approved.

Deliverability

A new domain earns its volume. Mailbase makes it wait.

Buy a domain in Mailbase or connect yours: SPF, DKIM, DMARC and the reply MX are written for you. Then each domain warms up on its own — 20 emails on day one, the next stage only while real bounces and complaints stay low.

Set up for youRecords written and re-checked until they verify. Each domain sends under its own identity, so one domain’s trouble stays its own.
A ramp that listensTen stages, 20 to 20,000 a day. Up only while 7-day bounces stay under 2% and complaints under 0.1%; back down, or paused, when they don’t.
The right people firstContacts who replied, clicked or opened go first, and each day’s volume is spread over ten hours.
No fake engagementNo warm-up network, no robot inboxes opening your mail. Mailbox providers score real people, so that is what we measure.

How deliverability works Check your domain — free

mailbase.studio/app/insights/domains

your-domain.com

warm-up · stage 4 of 10

Warming up

SPFDKIMDMARCMX

20/daytoday 25020,000/day

Move up: bounces < 2 % · complaints < 0.1 %
Step back: ≥ 2 % · ≥ 0.1 %
Pause: ≥ 5 % · ≥ 0.3 %
Pacing: spread over 10 h · idle 30 d → 3 back

05Compare

Mailbase vs buying a file vs a generic tool.

Three ways to fill a French B2B pipeline. Only one starts from the register.

	Mailbase	Buying a file	Generic cold-email tool
Where companies come from	SIRENE, the official register — live	A file compiled in the pastclosed companies can linger	A global contact databasecoverage of small French firms varies
Where the email comes from	Read in the legal notice or contact page	Source rarely disclosed	Database or pattern-guessedprenom.nom@…
Checked before sending	Every address — mail server, mailbox, catch-all	Up to youbounces are yours	Often a separate step
How each email is written	One real fact from their site per email	It’s a list — writing is up to you	A template with {{firstName}}
Compliance built in	Sender identity, opt-out and suppression on every send	Consent chain up to you	Configured by you
What you pay for	Verified prospects, from €0	Every row, right or wrong	Seats, per month

06Behind the agent

Prospecting is the front door. Behind it, everything email needs.

Campaigns, templates, tests, journeys, audiences and analytics live in the same workspace as the agent and the inbox — one send log, one suppression list, one set of numbers.

Campaigns & templates

MJML templates with a preview that is actually the email.

A structured section editor or raw MJML, your brand kit applied, spam-content and link checks, versions you can restore. Scheduled sends with a timezone, durable send jobs that retry per recipient.

Q3 update · scheduled Thu 09:00 · recipient timezone
Onboarding day 3 · opens and clicks tracked
Welcome · template v7 · brand kit applied

A/B tests

Pilot a slice, pick the winner by reply rate, roll it out.

Two to four variants, the metric you care about, the pilot share and the confidence threshold. Winners are statistical, not a guess; you can override.

Subject A · pilot slice · reply rate measured
Subject B · winner once the confidence threshold clears
Rollout to the remaining audience · one click

Journeys

Triggers become sequences, with exit rules that actually exit.

An import, a tag, a reply, an engagement event or a date starts a journey; send-email and webhook steps run server-side; dedupe and exit criteria are enforced, with a run log per contact.

Trigger: tag ‘demo booked’ → 3 steps
Exit on reply · the run log shows who left, and why
Webhook step → CRM · 200 OK

Audiences & forms

Lists you import, segments that update themselves, forms you host.

CSV import with saved mappings and duplicate detection, rule-based dynamic segments with live counts, hosted double opt-in forms you can embed, contact profiles with every send, event, reply and note.

Artisans 71 · dynamic segment · live count
Newsletter · double opt-in form
CSV import · duplicates detected and merged

Analytics

Delivery, opens, clicks, replies — with the bots filtered out.

Windowed rollups per campaign, provider health rates, bounce and complaint reasons clustered, machine opens and clicks removed, UTM source tracking on every link.

Delivered · bounced · by campaign and window
Replies · complaints · machine opens filtered out
Top source: prospecting or campaigns

Sending, your way

Managed sending from your domain, or your own Amazon SES.

Verify a domain and send through Mailbase. Already have an Amazon SES account? Connect it and pay only for the workflow layer.

Your own verified domainMailbase shows the DKIM and SPF records; sending unlocks when they verify.
Bring your own Amazon SES · €5/moYour AWS region and access key. Delivery stays on your own account and is never metered.
REST API and signed webhooksContacts, audiences, templates, campaigns and sending, with an OpenAPI contract, scoped tokens and idempotency keys.

bash

# Send through your workspace
$ curl -X POST https://mailbase.studio/api/v1/send \
    -H "Authorization: Bearer mb_live_…" \
    -d '{"to":"claire@marlot-electricite.example","subject":"Un devis en ligne"}'

✓ Queued · message id returned · webhook on delivery

07Pricing

Pay for verified prospects. Nothing else.

The unit is a verified prospect: a company with a checked email and a named person. Finding companies is never metered.

Every plan includes the reply inbox, the assistant and every safety guardrail.

Prices in EUR, excluding VAT, billed monthly.

Free

€0/ month excl. VAT

No card needed

Try the whole engine on a real target. No card.

25 verified prospects / month

200 emails a month
30 AI messages a month
Send from a Mailbase address
Reply inbox sorted by intent
1 user · 1 workspace

Start free

Starter

€9/ month excl. VAT

€0.030 per verified prospect

A steady stream of prospects for one person selling.

300 verified prospects / month

50,000 emails a month
500 AI messages a month, or your own key unmetered
Send from your own verified domain
Reply inbox sorted by intent
2 users · 3 workspaces

Choose Starter

Growth

€29/ month excl. VAT

€0.029 per verified prospect

Several targets running at once, with the numbers to compare them.

1,000 verified prospects / month

150,000 emails a month
2,000 AI messages a month, or your own key unmetered
Everything in Starter
A/B testing with an automatic winner
Deliverability analytics
5 users · 10 workspaces

Choose Growth

Scale

€79/ month excl. VAT

€0.020 per verified prospect

A sales team on the register.

4,000 verified prospects / month

500,000 emails a month
10,000 AI messages a month, or your own key unmetered
Everything in Growth
15 users · unlimited workspaces

Choose Scale

Need more this month? 500 verified prospects for €19, excl. VAT, one-time. Never expire.Buy a pack Full comparison

08Questions

Asked before signing up.

Something else? The docs cover setup, sending and the API. Read the docs →

Does it work outside France?

Discovery is built on the French company register, so it finds companies registered in France. Everything else — campaigns, the inbox, the assistant, the API — works for any audience anywhere.

Is this legal?

The register is public data published by INSEE. Emails are read from the company’s own site, the address the law requires it to publish. B2B prospecting by email is allowed in France with a professional address, a clear sender and a working opt-out; Mailbase adds all three on every send.

What is a verified prospect?

A company with an email found on its own site and checked against its mail server, and a named person to write to. That is the only step that counts against a plan; finding companies is free.

Do I have to approve every email?

Yes, until you decide otherwise. The first batch is always yours to review. After that you can let the agent send on its own, within your daily cap and hours, and switch back any time.

Start today

Name your customer. Start in minutes.

25 verified prospects free every month. No card. You approve every email before it leaves.

Start finding customers See pricing