Mailbase Resources
A hub for everything Mailbase publishes on prospecting and deliverability: guides on selling to French companies from the SIRENE register, on cold email and on keeping a sending domain out of spam, plus the free tools and the docs.
New here? Begin with the guide to prospecting from the SIRENE register (in French), or with how to write a cold email. If mail is landing in spam, the deliverability band starts with the basics and ends with an audit checklist, and the free tools check a domain or a draft in seconds.
Guides explain a concept end to end; the free tools give you an answer about your own domain or email; the docs cover setup and the API. The French guides also have their own index at /fr/blog.
Start Here
4Fichier SIRENE : prospection B2B depuis le registreFichier SIRENE, prospection B2B : comment tirer du registre public une liste propre, filtrée par code NAF, département et effectif, sans acheter un fichier.How to Write a Cold Email That Gets RepliesThe anatomy of a cold email people actually answer — relevance, brevity, one clear ask — plus the patterns that get you marked as spam.Cold Email Deliverability: A Practical ChecklistCold outreach lives or dies on deliverability. Here's the checklist that keeps you in the inbox: authentication, warmup, volume, and clean lists.SPF, DKIM, and DMARC Explained SimplySPF, DKIM, and DMARC explained in plain English: what each record does, how they work together to authenticate your email, how to set them up, and the common mistakes that break them.
Prospecting in France (en français)
8Fichier SIRENE : prospection B2B depuis le registreFichier SIRENE, prospection B2B : comment tirer du registre public une liste propre, filtrée par code NAF, département et effectif, sans acheter un fichier.Code NAF prospection : traduire un métier en code d’activitéLe code NAF prospection est le filtre le plus puissant du registre SIRENE, et le plus mal utilisé. Traduire un métier en codes, éviter les holdings et les activités mal déclarées.Trouver l’adresse mail d’une entreprise : 6 méthodesLa façon la plus fiable de trouver l’adresse mail d’une entreprise française est de lire les mentions légales de son site. Voici les six méthodes, de la plus sûre à la moins sûre, ce qu’il faut rejeter et pourquoi vérifier.Vérifier une adresse email avant d’envoyer : la méthodeComment vérifier une adresse email trouvée sur un site avant de lui écrire : syntaxe, MX, test SMTP, catch-all, adresses de remplissage, et ce qu’un rebond coûte à votre domaine.Prospection artisans par email : court, concret, une demandeLa prospection artisans par email ne ressemble pas au cold email SaaS : un fait vrai, quatre phrases, une demande simple, leurs horaires. Voici ce qui fait répondre.Exemples d’emails de prospection : 5 modèles et relancesUn email de prospection qui obtient une réponse tient en moins de cent mots : un fait, une proposition, une question. Voici un modèle à copier, cinq exemples avant et après avec leur objet, et deux relances.Cold email RGPD : les règles B2B de la CNIL en FranceLe cold email RGPD en B2B n’est pas interdit en France : la CNIL l’encadre. Adresse liée à la fonction, information, opposition simple, conservation limitée, et les interdits.Agent IA prospection : ce qu’il fait vraiment, étape par étapeUn agent IA prospection n’est pas un générateur de texte branché sur un fichier. Chaque étape, du registre à la lecture des réponses, ce qui reste humain, ce qu’il faut surveiller.
Cold Email
8How to Write a Cold Email That Gets RepliesThe anatomy of a cold email people actually answer — relevance, brevity, one clear ask — plus the patterns that get you marked as spam.11 Cold Email Templates That Get RepliesCopy-and-adapt cold email templates for the most common outreach goals, plus the personalization rules that keep them out of spam.Cold Email Subject Lines That Get OpenedThe subject line decides whether your cold email is read at all. Here's what gets opened — and what gets filtered.The Cold Email Follow-Up Sequence That WorksMost replies come from the follow-up, not the first email. Here's a cadence and a per-touch script that gets responses without annoying people.Cold Email Personalization That ScalesReal personalization is a relevant detail, not a merge tag. Here's how to personalize cold email at scale without sounding like a robot.How to Book Meetings With Cold EmailGetting a reply is step one; booking the meeting is the goal. Here's how to make the ask easy and turn cold opens into calendar invites.Cold Email vs Warm Email: What's the Difference?The difference between cold and warm email is prior relationship — and it changes everything about deliverability, expectations, and results.Email Reply Rate: How to Measure and Improve ItA practical guide to measuring email reply rate, classifying response quality, diagnosing low replies, and building campaigns that earn real conversations.
Finding And Verifying Emails
6How to Find Someone's Email Address (10 Ways)From email finder tools to pattern-matching and verification, here's how to find almost anyone's work email address — and confirm it's real before you send.How to Verify Email Addresses Before You SendVerifying your list is the cheapest insurance for deliverability. Here's how email verification works and how to build it into your sending.How to Find a Company's Email Address FormatOnce you know a company's email pattern, you can reach anyone there. Here's how to find the format and use it responsibly.What Is Email Enrichment? A Practical GuideEmail enrichment turns a bare address into a useful profile — company, role, and more. Here's how it works and how to use it responsibly.How to Find Email Addresses on LinkedInLinkedIn is where you find the right person; here's how to turn a profile into a verified work email — the legitimate way.Best Email Finder Tools for Cold OutreachThe email finder tools worth knowing, what each is good at, and how to pick one without overpaying for a database you won't use.
Lead Generation
6How to Build a B2B Prospect List That ConvertsA targeted list of 200 right-fit prospects beats 5,000 random ones. Here's how to define your ICP and build a list that converts.What Is an Ideal Customer Profile (ICP)?Your ICP is the filter for everything in outbound. Here's what it is, how to build one from real data, and how to use it.B2B Lead Generation With Email: A Founder's GuideEmail is still the highest-leverage B2B lead channel when you combine targeted outreach with opt-in capture and genuine nurture. Here's the system.Sales Prospecting: A Practical Guide for TeamsProspecting is the top of the sales funnel done deliberately. Here's the repeatable process from ICP to qualified conversation.Outbound vs Inbound Lead GenerationOutbound buys speed; inbound compounds. Here's how the two lead-gen motions compare and how to balance them by stage.Building an Email Outreach Strategy That WorksOutreach without a strategy is just spam with extra steps. Here's how to build one — targeting, messaging, cadence, and the metrics that matter.
Deliverability
10Email Deliverability Basics for SaaS FoundersEmail deliverability explained for founders: the five things that decide whether you reach the inbox — authentication, reputation, list hygiene, engagement, and compliance — and how to monitor them.Domain Warmup for SaaS Email: A Practical GuideHow to warm up a new sending domain or IP: why it matters, a week-by-week volume ramp, automated warmup, and how to keep reputation once you're warm.DMARC Reports Explained: How to Read and Act on ThemA practical guide to DMARC reports: what RUA aggregate files mean, which failures matter, and how to turn reporting into safer email authentication.Email Bounce Management for SaaS TeamsHard vs soft bounces explained, what causes them, how to handle each, acceptable bounce rates, and why suppressing bounces automatically protects your sender reputation.Email Complaint Rate: How to Monitor and Reduce ItLearn how to monitor email complaint rate, diagnose why subscribers mark messages as spam, and reduce complaints with consent, segmentation, unsubscribe, and suppression fixes.Email List Hygiene: A Practical Maintenance PlaybookA practical email list hygiene framework: diagnose list risk, segment by engagement, verify carefully, suppress correctly, and turn cleanup into a recurring operating rhythm.Email Spam Traps: How to Find and Avoid ThemA practical playbook for understanding email spam traps, investigating list-source risk, cleaning risky segments, and preventing future trap hits.Email Blocklist Removal: A Practical Recovery PlaybookA practical recovery playbook for diagnosing email blocklist listings, fixing the root cause, requesting delisting, and rebuilding sender reputation safely.Email Deliverability Audit: A Practical ChecklistA practical email deliverability audit checklist for teams that need to find authentication gaps, list-risk patterns, reputation issues, and workflow fixes before the next send.List-Unsubscribe Header: One-Click Setup GuideA practical guide to List-Unsubscribe and one-click unsubscribe headers for marketers, SaaS teams, and email operators who want fewer complaints and cleaner suppression.
Free Tools
8Free email deliverability toolsCheck a domain, generate SPF and DMARC records, and check a first email before you send it. No account.French company searchDescribe a trade, pick a département and a size: how many active companies the French register lists, and ten of them.French company lookupA name, a SIREN or a SIRET: what the register publishes — activity code, head office, creation date, size, leaders.Cold email subject linesWho you write to and what you offer: subject lines that read like a person wrote them, with what to avoid flagged.Domain checkSPF, DKIM, DMARC and MX read from DNS, with what each one means and what to fix.Cold email checkerPaste a first email: length, links, pressure words, the question, the way to say no — in English or French.SPF record generatorTick the services you send through and get one valid SPF record, inside the 10-lookup limit.DMARC record generatorPick a policy and a report address; get the record and where to put it.
Product
6Prospecting that starts from the French company registerName your customer. Mailbase finds every matching company in the register, finds who to write to, verifies the email, writes one email per person, and sends a few a day — after you approve.Deliverability that starts before the first emailBuy a domain or connect yours. Mailbase writes SPF, DKIM, DMARC and the reply MX, then warms the domain up on real engagement — and stops it before it gets burned.Read every reply, sorted the way an inbox should beA real inbox for outbound email: hot leads, needs reply, auto-handled, with tags you actually control.A/B testing that picks the winner for youPilot a slice of the audience, let Mailbase choose the winner by reply rate, roll the winner out to the rest in one click.Mailbase pricingPlans are priced by verified prospect, from a free plan; sending, the reply inbox and the AI assistant are included.Mailbase ChangelogWhat shipped, by date: register-based prospecting, Amazon SES sending, per-domain warm-up, scam screening, analytics and free tools.
Operational Docs
8REST API referenceSend email, list campaigns and create audiences from your backend, with scoped tokens and signed webhooks.Unsubscribe and compliance controlsHow Mailbase signs unsubscribe links, enforces suppression states, adds List-Unsubscribe headers, and keeps marketing sends compliant.API tokens and scopesCreate, scope, rotate, and verify Mailbase API tokens for workspace-safe backend integrations.Sender domains, Amazon SES and domain warm-upBuy or connect a sending domain, publish SPF, DKIM and DMARC, and let Mailbase warm each domain up on real engagement while it sends through Amazon SES.MCP OAuth setupConnect Claude, Cursor, Codex, or another MCP client to Mailbase with OAuth-scoped workspace access.Claude Code pluginRun Mailbase from Claude Code: the official plugin connects the Mailbase MCP server and adds skills and slash commands for prospecting, campaigns, replies and sending setup.Mailbase CLIThe mailbase command-line tool: every Mailbase capability as a predictable command, with JSON output and stable exit codes, built for coding agents and scripts.No-code integrations with Zapier, Make and n8nConnect Mailbase to Zapier, Make, or n8n with REST Hooks: subscribe a callback URL to an event, sample real payloads while you build, and unsubscribe when the automation is turned off.
Compare
4Mailbase vs lemlistA fair comparison between lemlist, a multichannel outbound platform, and Mailbase, which builds its list from the French company register and writes by email only.lemlist Alternative for Prospecting French CompaniesA fair lemlist alternative for teams that only prospect French businesses by email and would rather start from the public register than from a lead database.Instantly Alternative: Prospecting from the French RegisterA fair Instantly alternative for teams whose customers are French businesses: the list comes from the public register and every email is approved by you.Smartlead Alternative for Selling to French CompaniesA fair Smartlead alternative for small teams that prospect French businesses and would rather warm one domain honestly than rotate many mailboxes.