Prospecting agent · built on 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.

  • Free to start, no card
  • Every company in France
  • Emails verified before anyone writes
  • You approve every email
Version française →
Prospecting145
Electricians · Saône-et-Loire · 1 to 9 staff
43.21A · department 71 · bands 01–03
Found145
Site1510 %
Email1387 %
Verified13100 %

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

Drafts waiting for you13
Horloges Plaire · Saint-Symphorien-de-Marmagne
Franck Schaeffer · contact@horlogesplaire.frverified
from their site · 40 years · tower clocks
Vos beffrois et une nouvelle génération

Bonjour Franck, Votre atelier restaure des horloges d’édifice et des cloches classées depuis quarante ans. Nous créons des expériences Roblox pour faire découvrir un savoir-faire aux 10–25 ans. Un appel de 15 minutes cette semaine pour voir si ça a du sens pour vous ?

2 s to write · screened · waiting for youRejectApprove
How it runs

Four steps, each one a real tool you can watch.

This is the order the engine works in, taken from the Prospecting screen itself.

  1. 01

    Finds the companies

    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.

  2. 02

    Finds who to write to

    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.

  3. 03

    Writes one email each

    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.

  4. 04

    Sends a few a day

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

Reply inbox

Every reply sorted by intent, with the next move drafted.

Inbound mail routes to the right workspace by sender domain, gets classified on arrival — hot, warm, objection, out of office — and lands assigned, with a suggested reply. Two people typing on the same thread get a collision warning.

See the reply inbox
Inbox
InboxHot leadsNeeds replySentArchived
Hot leads · 2
Franck Schaeffer8 min
Re: Vos beffrois et une nouvelle génération
Hot
Loïc Legrand1 h
Re: Trois générations d’électriciens à Givry
Warm
Needs reply · 2
Patrice Godot3 h
Re: Sogelec — votre démarche
Objection
Eric Pierron5 h
Réponse automatique : absent jusqu’au 12
Out of office
Suggested reply

Bonjour Franck, merci pour votre retour. Mardi 11h ou jeudi 15h vous conviendrait ?

Use draft
The rest of the mailbox

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.

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.

Campaigns & templates
Q3 update · 240 contacts · scheduled Thu 09:00
Onboarding day 3 · 1,180 sent · 41 % opened
Welcome · template v7 · brand kit applied
The assistant

Ask for the thing. It proposes; you decide.

The assistant runs inside the product on the model you choose. It searches your mail, reads threads, compiles targets and drafts in place. Anything that reaches a person waits for your approval. Once you trust an action, let it run.

  • Model-agnostic: OpenAI, Claude, DeepSeek or a local model
  • Bring your own key or subscription, unmetered
  • Ask mode by default; auto mode per action, once you trust it
The assistant
Find me plumbers with 1 to 9 staff in Gironde and write to them.
search_naf« plombier » → 43.22A · Travaux d’installation d’eau et de gaz
compile_icp_query43.22A · dept 33 · 1–9 staff · head office only → ≈ 612 companies
612 plumbing companies in the Gironde, 1 to 9 staff. Shall I start discovery? Nothing is sent until you approve the first batch of drafts.
Start discovery
What keeps you out of trouble

Built to protect your sending domain, not just to send.

Cold email goes wrong quietly. These are on by default.

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.

Sending, your way

Managed sending from your domain, or your own useSend.

Verify a domain and send through Mailbase. Already run useSend on Coolify, Railway or a VPS? 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 useSend · €5/moYour API URL, key and webhook secret. Delivery stays on your infrastructure 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":"franck@horlogesplaire.fr","subject":"Vos beffrois"}'

✓ Queued · message id returned · webhook on delivery
Pricing

Every plan includes verified prospects. Start free.

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

Free
Free
25 verified prospects / month

One real target, end to end.

Start free
Starter
9/month
300 verified prospects / month

A steady stream for one person selling.

Start free
Growth
29/month
1,000 verified prospects / month

Several targets, with the numbers to compare them.

Start free
Scale
79/month
4,000 verified prospects / month

A sales team on the register.

Start free
One real run, 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.

145
companies found
every active match in the register
15
websites confirmed
proven by SIREN or name and town on the page
13
emails found
read on their own site
13
emails verified
mail server checked
5
wrong sites rejected
the legal notice named another SIREN
2 s
per email written
from a real fact, in French

Questions

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.

Name your customer. Start in minutes.