Email is dead, they say. And yet, every year, the figures tell a very different story. Email marketing remains, with one of the highest return on investment of all channels, the most profitable marketing lever available to very small businesses and SMEs. Even better: it's accessible, measurable, and entirely controllable, without a huge advertising budget or a dedicated team.
But an inbox is a contested territory. Spam filters are getting stricter, subscribers are becoming more selective, and the competition for attention is fierce. Building an email marketing strategy that actually generates sales therefore requires much more than a weekly send. It requires a method: clear objectives, a qualified list, messages designed to be opened and clicked, a robust technical infrastructure, and rigorous performance tracking.
This guide provides you with this method, step by step.
Why email marketing remains the most profitable channel
Before discussing methods, let's lay the groundwork: why invest time in email marketing rather than social media, online advertising, or SEO?
The answer can be summed up in three words: ownership, profitability, predictability.
You have your list. Unlike your Instagram followers or LinkedIn audience, your email list belongs to you. An algorithm change can't reduce your reach tenfold overnight. It's the only marketing channel where you truly control your audience.
The ROI is unparalleled. The 2026 benchmarks converge: email marketing generates on average 32 to 36 euros return for every euro investedNo other channel produces such results at a comparable cost for a micro-enterprise or SME.
Email is asynchronous and non-intrusive. Unlike a phone call, your recipient can read your message at their convenience. This reduces initial resistance and encourages more attentive reading.
Automated workflows increase efficiency tenfold. Sequence emails (nurturing, welcome, follow-up) consistently outperform one-off campaigns: +30 to 50% increase in open rate and +40 to 70% increase in click-through rate compared to ad hoc mailings. Once configured, these scenarios run without intervention.
Finally, email marketing integrates naturally into your CRM and to your other management tools. Every interaction, every click, every conversion enriches your knowledge of your prospects and customers, and fuels a virtuous cycle of personalization.
Define your objectives and target audience (segmentation)
An email marketing strategy without a clear objective is like sending a message to no one. Before writing any message, answer two fundamental questions: What do you want to achieve? et Who are you addressing?
Set SMART goals
Your objectives must be Specific, Measurable, Achievable, Relevant, and Time-bound. Here are some concrete examples for a very small business/small and medium-sized enterprise (SME):
These objectives determine the type of campaign to implement, the sending frequency, and the KPIs to monitor.
Segment to personalize
Sending the same message to your entire database is the most common and costly mistake. Segmented campaigns generate significantly more revenue than generic mailings (Lumo Data, 2026). In B2B, the most effective segmentation strategies are:
| Criterion | Application example |
|---|---|
| Function / role | The executive receives a ROI argument, the operations manager a practical guide |
| Industry sectors | The message is tailored to the specific challenges of each industry. |
| Company size | Very small business with 5 people vs. SMEs with 80 employees: different needs |
| Purchase phase | Prospect in the discovery phase vs. lead who requested a quote |
| Behavior | Opened 3 emails without clicking, downloaded a white paper, visited the pricing page |
To begin, 3 to 5 segments are more than enoughEach segment must contain a minimum of 100 contacts to allow for reliable statistical analysis (Lumo Data, 2026). Segmentation that is too granular on a small base produces the opposite effect to that intended.
The resulting personalization is not insignificant: personalization by first name, company, or sector improves performance. 8 to 15% per relevant fieldPersonalized email subject lines achieve an open rate of 26% according to DMA France, compared to significantly lower results for generic objects (emailing software, 2026).
Building and growing your subscriber list (GDPR included)
A qualified subscriber list is your most valuable marketing asset. Its quality always trumps its size. 1,000 engaged contacts are worth more than 10,000 addresses collected indiscriminately..
Legitimate collection methods
Several levers can be used to grow your list organically and compliantly:
GDPR rules that must be strictly followed
Commercial email marketing is strictly regulated by the GDPR and the CNIL. Failure to comply can result in fines of up to 20 million euros or 4% of global annual turnover (Hashtag Lawyers, 2025).
The essential rules to remember:
In B2C (individuals): le consent Explicit and prior consent is mandatory. The person must take a clear positive action (checkbox, never pre-checked) to agree to receive your marketing emails. Inaction is considered refusal.
In B2B (professionals): Email marketing is permitted under the legitimate interest regime (GDPR art. 6.1.f), provided that the message directly relates to the recipient's professional activity and that a clear unsubscribe link is present in each email.
In all cases :
The double opt-in (confirmation by email before adding to the list) is highly recommended: it guarantees the validity of consent, reduces fraudulent registrations and improves the quality of your database.
Maintain your list regularly
An email database naturally degrades. Approximately 25 to 30% of B2B data becomes obsolete every year (job changes, company closures, abandoned addresses). Clean your list at least twice a year: remove hard bounces immediately, manage repeated soft bounces, and quarantine contacts that have been inactive for more than 12 months before deleting them.
Types of campaigns: newsletter, nurturing, promotion, transactional
A mature email marketing strategy is not based on a single type of email. Each format serves a specific purpose and targets a specific moment in the customer journey.
The newsletter
A newsletter is a regular mailing (weekly, bi-weekly, or monthly) that shares news, advice, trends, or useful resources. Its goal is not to sell directly, but to stay top of mind for your contacts and to nurture the relationship over time. It is particularly effective for companies that produce content (blog articles, case studies, videos).
Nurturing emails (lead nurturing)
Nurturing is a sequence of automated emails designed to to support a prospect in their decision-making processFrom the discovery phase to conversion, a typical B2B nurturing sequence consists of 5 to 10 emails spread over 2 to 4 weeks, with progressively increasing content: educational content, customer case studies, testimonials, and then an invitation to a meeting or trial. Nurturing emails consistently outperform one-off campaigns.
Promotional campaigns
These mailings are concentrated around key marketing moments: product launches, seasonal offers, or limited-time promotions. They should be used sparingly to avoid overwhelming your audience and to maintain your deliverability rate. A frequency of 1 to 2 emails per week maximum is the equilibrium point for the majority of B2B audiences.
Transactional emails
Transactional emails are sent automatically following a user action: order confirmation, password reset, appointment reminder, invoice. They have the highest open rates of all email types because they are expected and relevant. Pay attention to them: a well-designed transactional email builds trust and can include additional recommendations.
Reactivation emails
These emails, intended for contacts inactive for 90 days or more, attempt to rekindle interest before their permanent removal from the list. A sequence of 2 to 3 emails with a direct subject line ("We miss you," "Still here?") helps to recover some of these contacts. Those who don't respond should be removed from the active list to protect your deliverability.
Write emails that get opened and clicked (subject line, content, CTA)
The best targeting in the world is useless if your email isn't opened. And an email opened without a click generates no conversions. Here are the levers that make the difference.
The subject: the number one factor in open rates
The subject line is the first thing your recipient sees. It's what decides whether the email will be opened or ignored. Here are a few tried-and-tested rules:
The most effective object formats in B2B: the direct question, the reference to a concrete figure, the mention of the first name followed by a precise context, and the event trigger ("Following your download…").
The content: talk about them, not about you
An effective email follows a simple rule: 70% of the content focuses on the reader's problem or interest, 30% on your solutionReverse this ratio and your response rate collapses.
Some principles to apply:
The CTA: a single, clear, and frictionless approach
Don't offer your reader three options. A single, precise, and actionable call to action is far more effective than a list of links. Examples: "Book 20 minutes on Thursday or Friday," "Download the guide," "Request your demo." The CTA should answer the question: what is the next logical step for this reader at this precise point in their journey?
Deliverability: avoiding spam (SPF, DKIM, reputation)
You can write the most relevant email in the world: if it ends up in spam, no one will see it. Deliverability is the most underestimated technical aspect of email marketing, and one of the most crucial.
The three essential authentication protocols
SPF (Sender Policy Framework) Declare in your DNS which servers are authorized to send emails on behalf of your domain. Without a valid SPF record, a significant portion of your emails will be considered suspicious.
DKIM (DomainKeys Identified Mail) It adds a cryptographic signature to each email to prove it hasn't been altered between sending and receiving. Gmail and Yahoo now require DKIM for high-volume senders.
DMARC (Domain-based Message Authentication, Reporting and Conformance) It relies on SPF and DKIM to define the policy to apply to emails that fail verification. It also generates reports that allow you to monitor attempts to spoof your domain. The recommended policy to start with: p=quarantine, with the goal of evolving towards p=reject (Mailgun, 2025).
In 2024, Gmail and Yahoo tightened their requirements: SPF, DKIM and DMARC are now mandatory for high-volume shippers, with a spam complaint rate to be kept below 0,1% (Johan Denoyer, 2025).
Sender reputation
Your reputation is built with every email you send. Positive signals (opens, clicks, replies) improve your score. Negative signals (spam complaints, hard bounces, unread deletions) lower it. To protect your reputation:
Measuring and optimizing: email marketing KPIs
What you don't measure, you can't improve. Here are the key metrics to monitor and benchmarks to assess your performance.
Key KPIs
The opening rate This measures the percentage of your emails that are actually opened. Note: since Apple Mail Privacy Protection (MPP), this figure is partially skewed upwards by the automatic preloading of tracking pixels. Use it as a relative indicator (to compare two objects in A/B testing) rather than as an absolute value.
Click-through rate (CTR) It measures the proportion of recipients who clicked on at least one link. This is a more reliable indicator of engagement than the open rate.
The reaction time (CTOR) It compares clicks to opens. It measures the quality of your content among those who actually opened the email. In France, the average is around 11% (an email marketing software, 2026).
Le Conversion rate Link your mailings to your business results: quote requests, registrations, purchases. This is the most important KPI for evaluating the real impact of your campaigns.
The unsubscribe rate must remain under 0,5% per shipmentBeyond that, it's a signal that your frequency is too high or your content is not relevant enough.
The spam complaint rate must remain under 0,1%This is a critical signal for your deliverability.
2026 benchmarks in France
According to the study, an email marketing software for 2025 focusing on 11,9 billion emails analyzed from 19,000 French companies (Ediware, 2026), the average open rate across all sectors is 33,9% (This should be qualified by Apple's MPP effect). In B2B, the benchmarks are as follows:
| Indicator | Reference B2B |
|---|---|
| Open rate (opt-in newsletter) | 25-35% |
| Open rate (cold prospecting) | 15-22% |
| Click rate | 2-4% |
| Acceptable unsubscribe rate | < 0,5% per shipment |
| Spam complaint rate | <0,1% |
| Recommended sending frequency | 2 to 4 times/month |
Continuously optimize
Optimization is an ongoing process. Test one variable at a time: the subject line, the send time, the CTA, the message length. Wait until you have at least 100 sends per variation before drawing any conclusions. The best time slots for B2B are Tuesday and Thursday between 8 and 10 a.m. or between 14 and 16 p.m., but these averages don't replace testing on your own database.
Mistakes to avoid
Even with good intentions, certain practices systematically sabotage the results of an email marketing strategy.
Send without segmentation. A generic message sent to the entire database performs 3 to 5 times worse than an email segmented by behavior or profile. This is the most common and costly mistake.
Ignoring the subject line of the email. The product is the first point of contact. If it's poorly designed, the rest of the work is pointless. Yet, few shippers systematically test their products.
Buy email lists. This is prohibited by the GDPR, destructive to your deliverability and ineffective: these lists contain obsolete addresses, spam traps and contacts who have never asked you to contact them.
Sending too often (or not enough). Over-solicitation leads to increased unsubscribes and complaints. Prolonged absence causes people to forget your brand and damages your sender reputation when they resume.
Forget about post-sending analysis. Sending out campaigns without analyzing the results is like moving forward blindly. Each campaign must be reviewed: what worked well? What can be improved?
Neglecting technical deliverability. SPF, DKIM, and DMARC are not optional. An unauthenticated email that lands in spam is a wasted effort, regardless of the quality of its content.
Not personalized enough. “Hello [First Name]” is no longer enough. The personalization that makes the difference is the one that is based on a real context: sector, recent behavior, stage in the buying cycle.
Offering too many CTAs. An email with five links to five different actions creates confusion. A single, clear, and concise call to action converts much better.
Ignore those who have unsubscribed. Treating an unsubscribe as a failure is a mistake. On the contrary, it's a valuable signal and a legal obligation that must be honored immediately. A contact who unsubscribes rather than reporting you as spam is doing you a favor.
How Djaboo helps you manage your email marketing strategy
Implementing an effective email marketing strategy requires centralizing your contacts, tracking your interactions, and automating your sequences while keeping track of your projects and invoicing. That's precisely what Djaboo offers: an all-in-one platform designed for small and medium-sized businesses (SMBs) that combines CRM, project management, invoicing, and collaboration tools in one place. This allows you to connect your sales activity to your customer relationships, segment your contacts based on their history, and trigger the right actions at the right time, without juggling multiple tools. Djaboo is designed for teams of 1 to 100+ people, with no technical expertise required.
FAQ: Your questions about email marketing strategy
What sending frequency should I adopt so as not to tire out my list?
In B2B, the optimal frequency is between one and two emails per week. Beyond that, the unsubscribe rate increases significantly. For a newsletter, a monthly or bi-monthly frequency is often sufficient. The key is consistency: regular mailings build a solid reputation, while inconsistencies (prolonged silence followed by a mass mailing) trigger spam filters.
What size list is needed to obtain meaningful results?
A list of 500 to 1,000 qualified contacts already yields measurable results. Below 100 contacts per segment, statistical optimization becomes difficult. Quality always trumps quantity: 500 engaged and opt-in contacts generate more value than 5,000 addresses collected indiscriminately.
How can I tell if my emails are ending up in spam?
Several warning signs should alert you: a sudden drop in open rates, a plummeting click-through rate, or feedback from contacts indicating they are no longer receiving your emails. To diagnose the problem, check your SPF, DKIM, and DMARC settings with a tool like MXToolbox, monitor your domain reputation using Google Postmaster Tools, and verify that your IP address or domain is not on a blacklist.
What is the difference between a nurturing email and a newsletter?
A newsletter is a one-time email sent to your entire list or a specific segment, usually at regular intervals. Its purpose is to maintain the relationship and share valuable information. A nurturing email is part of an automated sequence triggered by an event (sign-up, download, visit to a key page) and guides the prospect through their decision-making process with progressively more tailored content. The two are complementary and serve different purposes within your overall strategy.
