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Practical guides on prospecting from the French company register, cold email that earns a reply, finding and verifying addresses, and deliverability. Filter by topic or search.

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Lead generation

How to Find Companies in France: A Guide to the SIRENE Register

To find companies in France, start from the free public register of every company: how it works, what it holds and how to turn it into a prospect list you can legally email.

MTMailbase Team9 min read
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66 posts

Deliverability

DKIM Key Rotation: A Zero-Downtime Runbook

A practical, zero-downtime DKIM key rotation runbook with selector inventory, DNS overlap, canary validation, rollback criteria, and old-key retirement.

MTMailbase Team9 min read
Email marketing

Email A/B Testing: A Practical Framework

A practical email A/B testing guide for planning useful experiments, avoiding false winners, and turning campaign results into repeatable decisions.

MTMailbase Team8 min read
Deliverability

Dedicated IP vs Shared IP Email: Which to Use?

A dedicated IP vs shared IP email guide for deciding when to use a shared pool and when a dedicated sending IP is worth the warmup work.

MTMailbase Team8 min read
Deliverability

SMTP Bounce Codes: How to Read and Act on Failed Email

A practical operator guide to SMTP bounce codes: classify failures, choose retries vs suppressions, and build a safer response workflow.

MTMailbase Team8 min read
Deliverability

Email Deliverability Incident Response: A Recovery Playbook

A practical incident-response playbook for sudden inboxing drops, bounce spikes, complaint spikes, blocklists, authentication failures, and reputation recovery.

MTMailbase Team10 min read
Deliverability

List-Unsubscribe Header: One-Click Setup Guide

A practical guide to List-Unsubscribe and one-click unsubscribe headers for marketers, SaaS teams, and email operators who want fewer complaints and cleaner suppression.

MTMailbase Team9 min read
Deliverability

Email Authentication Alignment: SPF, DKIM, and DMARC

A practical email authentication alignment guide for teams that want SPF, DKIM, and DMARC to pass consistently across transactional and marketing mail.

MTMailbase Team8 min read
Deliverability

Email Feedback Loops: Complaint Signals and Suppression Workflow

A practical guide to email feedback loops: provider complaint signals, Feedback-ID tagging, suppression rules, monitoring, and operating playbooks.

MTMailbase Team9 min read
Deliverability

Email Subdomain Strategy: Separate Mailstreams Safely

A practical email subdomain strategy for separating mailstreams without fragmenting ownership, analytics, suppression, or sender reputation.

MTMailbase Team9 min read
Email infrastructure

SMTP Deferrals: How to Troubleshoot Temporary Email Failures

A practical SMTP deferrals playbook: classify temporary failures, slow the right queue, fix the cause, and avoid turning retries into a deliverability incident.

MTMailbase Team9 min read
Deliverability

Email List Hygiene: A Practical Maintenance Playbook

A practical email list hygiene framework: diagnose list risk, segment by engagement, verify carefully, suppress correctly, and turn cleanup into a recurring operating rhythm.

MTMailbase Team9 min read
Email infrastructure

Email Send Throttling: A Practical Playbook

A practical email send throttling framework for pacing sends by domain, engagement, provider feedback, and risk windows without starving important mail.

MTMailbase Team9 min read
Deliverability

MTA-STS and TLS Reporting for Email Operators

A practical operator guide to MTA-STS and TLS-RPT: what they protect, what records to publish, how to test safely, and what mistakes to avoid.

MTMailbase Team8 min read
Deliverability

Email Domain Migration Checklist: Move Without Breaking Deliverability

A step-by-step email domain migration checklist for changing sending domains or subdomains without losing authentication, reputation, or suppression history.

MTMailbase Team9 min read
Deliverability

ARC Email Authentication: What It Does and When to Use It

A practical guide to ARC email authentication: what it solves, where it helps, where it does not, and how email operators should evaluate it.

MTMailbase Team8 min read
Deliverability

Email Deliverability Monitoring: A Practical Playbook

A practical email deliverability monitoring playbook for teams that need early warning signals, weekly checks, and clear incident response steps.

MTMailbase Team9 min read
Email marketing

Email Cadence Best Practices: How Often to Send

Email cadence best practices for choosing frequency by mailstream, audience intent, engagement, and risk so you can send without exhausting subscribers.

MTMailbase Team8 min read
Email marketing

Email Reply Rate: How to Measure and Improve It

A practical guide to measuring email reply rate, classifying response quality, diagnosing low replies, and building campaigns that earn real conversations.

MTMailbase Team8 min read
Email marketing

Email Footer Best Practices: Compliance and Trust

A practical guide to building email footers that satisfy compliance needs, reduce complaints, improve trust, and stay useful on mobile and in plain text.

MTMailbase Team7 min read
Deliverability

Email Blocklist Removal: A Practical Recovery Playbook

A practical recovery playbook for diagnosing email blocklist listings, fixing the root cause, requesting delisting, and rebuilding sender reputation safely.

MTMailbase Team8 min read
Deliverability

Email Spam Traps: How to Find and Avoid Them

A practical playbook for understanding email spam traps, investigating list-source risk, cleaning risky segments, and preventing future trap hits.

MTMailbase Team8 min read
Deliverability

Email Deliverability Audit: A Practical Checklist

A 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.

MTMailbase Team9 min read
Deliverability

Email Complaint Rate: How to Monitor and Reduce It

Learn how to monitor email complaint rate, diagnose why subscribers mark messages as spam, and reduce complaints with consent, segmentation, unsubscribe, and suppression fixes.

MTMailbase Team8 min read
Deliverability

Custom Email Tracking Domain: A Practical Guide

A practical guide to custom email tracking domains: when to use one, how DNS and redirects work, what to test, and how to avoid deliverability mistakes.

MTMailbase Team8 min read

The Mailbase blog is a working library for people who find and write to their next customers themselves. One thread is prospecting in France, written in French: finding every matching company in the register (SIRENE), translating a trade into NAF codes, reading a site’s mentions légales for the operator and a real contact, verifying an email before anyone writes, and what the CNIL allows for B2B outreach. The French guides have their own hub at /fr/blog.

The other threads are the ones every cold sender runs into: how to write a cold email, subject lines, templates and a follow-up sequence; how to find and verify an address; how to build a prospect list and define an ideal customer profile; and deliverability — SPF, DKIM and DMARC, warming a new domain, bounces, complaints, blocklists and spam traps. Several guides link to the free tools that check a domain or a first email. Every guide is written to be specific and honest: concrete steps and tradeoffs, not filler.