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Sending an email to a client is as easy as using any smartphone. However, managing a coherent, legal, and profitable email marketing strategy for an SME is a different story. Between the increasingly demanding technical requirements, the more stringent regulatory obligations due to CNIL sanctions, and the proliferation of tools all promising to "revolutionize your customer relationship," it's easy to get lost. This article provides you with the practical guidance you need to choose the right software, build a healthy contact database, stay within legal boundaries, and make email marketing a true growth driver, without having to become a technical expert.
What is the real purpose of email marketing software?
Email marketing software isn't used to send emails. This statement may seem paradoxical, but it conveys a crucial point: any email account allows you to send messages. What email marketing software does is something else entirely.
It allows you to send messages to hundreds or thousands of contacts simultaneously, while respecting the technical rules that govern their arrival in the inbox. It gives you the means to segment your database, meaning you can send the right message to the right person at the right time, without having to manually manage each mailing. It automates entire sequences: a welcome email when someone subscribes to your list, a reminder when a prospect hasn't responded, a follow-up after a period of inactivity.
It also measures what happens after sending: how many people opened your message, how many clicked, and how many unsubscribed. This data, inaccessible with a simple email client, is what allows you to improve your campaigns over time.
Finally, email marketing software handles the technical constraints you don't see: authenticating your sender domain, automatically managing unsubscribes, and processing invalid addresses. Without these mechanisms, your emails end up in spam, or worse, your domain gets blacklisted.
For an SME, the challenge isn't having the most sophisticated tool on the market. It's having a tool that matches your contact volume, your internal resources, your business objectives, and that integrates with the other tools you already use: your CRM , your invoicing tool, your website.
Email marketing, newsletters, transactional emails: don't mix them all up
These three terms are often used interchangeably. This is a mistake that has practical, technical, and legal consequences.
Emailing is the generic term. It refers to any email sent to a contact list, whether it's a promotion, an invitation, a sales follow-up, or product information. It's the envelope that contains the other categories.
The newsletter A newsletter is a specific type of email marketing. It's sent at regular intervals, weekly or monthly, to subscribers who have voluntarily signed up. Its primary objective is to inform and build loyalty, not to sell directly. It cultivates a long-term relationship. A newsletter that offers no informative value and is simply a catalog of promotions isn't a newsletter: it's a disguised sales campaign, and your subscribers will sense it.
Transactional email is of a different nature. It is triggered automatically by a specific user action: order confirmation, password reset, shipping notification, or quote acknowledgment. It is not sent en masse; it is individual and anticipated. This is precisely why its open rates are structurally much higher than those of marketing campaigns: the recipient expects it and seeks the information it contains.
This distinction isn't merely academic. From a technical standpoint, it's strongly recommended to separate marketing and transactional email flows, ideally using subdomains or separate IP addresses. If a marketing campaign generates complaints, it shouldn't negatively impact the reputation of your transactional emails, which must arrive in inboxes without delay. Legally, transactional emails aren't subject to the same consent requirements as marketing emails, provided they remain strictly informational. As soon as promotional content is included, they fall under the category of email marketing.
Before choosing your software, clearly identify which types of emails you need to send. Not all tools handle all three categories with the same efficiency.
The 8 selection criteria for an SME
Choosing email marketing software by first looking at its features is putting the cart before the horse. The right approach is to start with your actual needs, then evaluate the tools based on those criteria.
1. The volume of contacts and mailings. The pricing of almost all email marketing software is based on the number of contacts in your database and the monthly volume of emails sent. Honestly assess your current situation and your likely growth over the next twelve months. A tool that's inexpensive today can become very costly as soon as your database expands.
2. Ease of use. A small or medium-sized enterprise (SME) typically doesn't have a dedicated developer or a full-time marketing manager. The tool must be usable by someone for whom this isn't their primary job. Test the interface before committing: creating an email, importing a list, and reading statistics should be accessible without extensive training.
3. Automation capabilities. Automation is what transforms email marketing from a distribution tool into a customer relationship management tool. Make sure the software allows you to create sequences triggered by events such as sign-up, inactivity, birthdays, or link clicks. The complexity of available scenarios varies considerably from one tool to another.
4. Deliverability. This is the most underestimated criterion. Software that sends your emails directly to spam is worthless, regardless of the quality of your content. Research the reputation of the sending infrastructure, its automatic bounce and complaint handling, and the authentication tools available.
5. Integrations with your existing ecosystem. Your email marketing software needs to be able to connect to your CRM, your invoicing tool, and your website. Without integration, you're managing data in silos and losing efficiency. Check for the availability of native connectors or an API for custom integrations.
6. Compliance GDPR. The tool must automatically manage unsubscribes, retain proof of consent, and allow you to respond to requests for access to or deletion of data. This is not an optional feature: it is a legal requirement.
7. The quality of the support. When a problem arises, you need a quick response. Check support hours, available channels (chat, phone, email), and whether support is available in French. Customer reviews on this point are often revealing.
8. Scalability and price transparency. Read the terms and conditions carefully. Some tools require you to upgrade your plan as soon as you exceed a certain contact threshold, with significant price increases. Others offer usage-based pricing, which is more flexible for fluctuating volumes. Avoid surprises by calculating the total cost over twelve months under several growth scenarios.
Building a healthy and legal contact base
A contact database is not just a list of email addresses. It's a strategic asset, and like any asset, it needs to be built, maintained, and protected.
The first rule is simple: never buy contact lists. Purchased addresses have not consented to receive your communications. They generate high complaint rates, damage your sender reputation, and expose you to penalties. It's a false economy on all levels.
Building a healthy customer base requires transparent data collection mechanisms: registration forms on your website, downloads of useful content in exchange for an email address, event registration, and sales contact followed by explicit opt-in. At each data collection point, the user must know what they are signing up for, how often they will receive messages, and how they can unsubscribe.
Le double opt in The recommended practice is as follows: after registration, the user receives a confirmation email and must click on a link to validate their subscription. This mechanism eliminates invalid addresses, reduces fraudulent registrations, and provides strong proof of consent. It automatically improves the quality of your database and, consequently, your engagement rates.
Regular database maintenance is just as important as building it. A list that isn't cleaned will naturally deteriorate: addresses become invalid, and contacts lose all relevance to your communications. It's recommended to perform a cleanup at least once or twice a year, removing addresses that generate hard bounces, contacts who haven't opened any of your emails in six to twelve months, and unsubscribers. Before deleting inactive contacts, send them a re-engagement campaign: if it doesn't produce any results, deletion is necessary.
A hard bounce rate above 2% for a campaign is a warning sign. It indicates that your database is poorly maintained and can trigger penalties from email providers. Keep this rate below this threshold by regularly validating your email addresses.
GDPR and email marketing: consent, opt-in, opt-out, legal basis
The legal framework for email marketing in France is based on two complementary texts: the General Data Protection Regulation (GDPR) and Article L34-5 of the Postal and Electronic Communications Code (CPCE).
Article L34-5 of the French Postal and Electronic Communications Code (CPCE) establishes the fundamental principle: direct marketing by electronic means to a natural person is prohibited without their prior consent. This consent must be freely given, specific, informed, and unambiguous. In practice, this means that a pre-checked box does not constitute valid consent. A confirmation button that serves both to register for a service and to accept marketing communications also does not constitute valid consent.
The CNIL (French Data Protection Authority) has strongly reiterated these requirements in several recent decisions. In May 2025, it fined a company €80,000 for conducting marketing campaigns without valid consent, notably because the forms used by its data providers visually highlighted the acceptance buttons while concealing the opt-out options within the text. The same logic led to a €900,000 fine against another company for similar breaches affecting several million people. These decisions illustrate that responsibility does not end with your own data collection: if you use data collected by a third party, you must ensure the validity of the consent obtained from that third party.
The B2C / B2B distinction is important. For individuals (B2C), prior consent is mandatory without exception. For businesses (B2B), there is a nuance: marketing can be based on legitimate interest, provided the message is directly related to the recipient's professional role and the recipient can easily object to it. However, this nuance does not exempt businesses from complying with the GDPR's obligations regarding transparency and the right to object.
The opt-out This is the mechanism by which a contact can unsubscribe. It must be as simple as opt-in: if someone subscribed with one click, they must be able to unsubscribe with one click. The CNIL (French Data Protection Authority) has penalized practices that required users to go through several steps to unsubscribe. A functional and visible unsubscribe link in every email is a legal obligation, not an option.
In terms of GDPR, you must also be able to prove consent for each contact: date, time, form used, and the exact content of that form at the time of registration. Your email marketing software must retain these records or allow you to export them. Finally, prospecting data can only be kept for a maximum of three years from the date of collection or the last genuine contact from the prospect.
Deliverability: authenticating your domain and protecting your reputation
Deliverability refers to your emails' ability to reach your recipients' inboxes, rather than their spam folders or being rejected before they even arrive. It's a technical topic, but it's impossible to ignore if you want your email marketing strategy to produce results.
Deliverability is based on three authentication protocols, published in your domain's DNS records.
SPF (Sender Policy Framework) SPF declares which servers are authorized to send emails on behalf of your domain. Without SPF, theoretically anyone can send an email impersonating you, and recipient servers have no way to verify the sender's legitimacy.
DKIM (DomainKeys Identified Mail) SPF adds a cryptographic signature to each outgoing email. The receiving server verifies this signature to ensure the message hasn't been altered in transit. SPF says "this server is authorized to send on our behalf"; DKIM says "this message hasn't been modified since it was sent".
DMARC (Domain-based Message Authentication, Reporting and Conformance) This layer sits above the two previous layers. It tells recipient servers what to do when an email fails SPF or DKIM checks: do nothing (p=none, observation mode), mark it as spam (p=quarantine), or reject it (p=reject). It also generates reports that allow you to monitor who is sending emails impersonating your domain.
Since February 2024, Google and Yahoo have required SPF, DKIM, and DMARC for any sender sending more than 5,000 messages per day to their domains. Microsoft joined these requirements in May 2025. Even below these thresholds, these protocols have become essential: according to AFNIC, an increasing number of email providers are requiring them, and their adoption on .fr domains is progressing steadily, but remains incomplete.
DMARC implementation should be gradual: start with `p=none` to collect reports and identify all your legitimate sending streams, then move to `p=quarantine`, and finally to `p=reject` once you are certain that all your legitimate sending is correctly authenticated. Moving directly to `p=reject` without this observation phase could block your own emails.
Beyond authentication, your sender reputation is built over time. It depends on your complaint rates, bounce rates, and recipient engagement. A complaint rate above 0,1% is a warning sign; above 0,3%, it's an emergency. If you're starting with a new IP address or domain, gradually increase your volume: begin with your most engaged contacts, double the volume every few days, and monitor the metrics at each stage.
Segment and personalize without a complex system
Segmentation is the art of not sending the same message to everyone. It's also one of the most effective practices for improving your email marketing results, and one of the most dreaded by SMEs who fear spending too much time on it.
The good news: you don't need dozens of segments to get meaningful results. Starting with three to five well-defined segments is already a solid approach. The bad news: overly broad segmentation delivers no value, and overly granular segmentation becomes unmanageable if you don't have the resources to produce differentiated content for each group.
The most useful segmentation criteria for an SME are as follows.
Status in the customer lifecycle Cold prospect, warm prospect, active customer, inactive customer, former customer. These four or five categories do not require sophisticated data and already allow you to radically adapt the tone and content of your messages.
Email behavior opened your last three emails, hasn't opened anything in six months, clicked on a specific link. This behavioral data is directly available in your email marketing software and provides a reliable indicator of your contacts' interest.
The sector of activity or the profile If you're selling to very different customer profiles, a message that resonates with a craftsman won't necessarily resonate with a sales director of an industrial SME. Segmenting by profile allows you to adapt your vocabulary, examples, and arguments.
Personalization goes beyond segmentation: it involves inserting elements specific to each contact into the body of the email (first name, company name, last interaction, product viewed). These elements, called dynamic variables, are supported by all reputable email marketing software. Their use mechanically improves open and click-through rates, provided the data is reliable and up-to-date.
One last point: personalization should remain within the bounds of what the recipient finds natural. Mentioning their first name in the subject line is expected. Referencing a navigation on your website without having mentioned it can seem intrusive. Adjust your level of personalization according to your relationship with your contacts.
Indicators to monitor and those that are no longer meaningful
Not all metrics are created equal. Some are useful for managing your campaigns; others create an illusion of performance that can lead you to make poor decisions.
Key indicators to monitor:
Le Conversion rate This is the most important metric. It measures the proportion of recipients who completed the desired action after receiving your email: a purchase, an appointment booking, a download, or a quote request. It's the only metric that truly tells you if your campaign achieved its objective.
Le click rate (CTR) measures the proportion of recipients who clicked on at least one link. It's an intermediate engagement metric: it indicates that your content generated enough interest to trigger an action, without specifying whether that action was successful. According to data from DMA France, the average click-through rate in France is 5,3%.
Le hard bounce rate This measures the proportion of emails that could not be delivered due to an invalid or non-existent address. It must be kept below 2%.
Le churn rate This is an indicator of the health of your relationship with your contacts. A high rate after a campaign means that the content was not relevant to the recipients, or that the sending frequency is too high.
Le spam complaint rate is the most critical factor for your sender reputation. It must remain below 0,1%.
The indicator that should be seriously put into perspective:
Le the opening rate has long been the king of email marketing KPIs. It's becoming less so. Since the rollout of Apple's Mail Privacy Protection feature in 2021, a growing proportion of recorded opens are phantom opens: Apple preloads emails in a protected environment, which triggers the pixel. tracking without the recipient actually opening the message. The open rate remains a useful trend indicator, but don't take its absolute values at face value. If your open rate increases sharply without a corresponding increase in your click-through rate, be wary.
According to data from DMA France, the average open rate in France is 18,2%, a figure significantly lower than the global average, reflecting still heterogeneous marketing practices. Automated and personalized campaigns structurally achieve better results than mass campaigns.
Mistakes that lead to spam filters
Ending up in the spam folder is the equivalent of throwing an email directly in the trash before it's even read. Here are the most common mistakes that lead to this.
Send to an unqualified or purchased list. This is the most serious and costly mistake. Addresses that haven't consented to receive your messages generate high complaint rates and may contain spam traps—addresses specifically created by blacklist operators to ensnare senders using poorly maintained databases. A single such address can be enough to trigger an immediate blacklisting.
Do not authenticate your domain. A domain without properly configured SPF, DKIM, and DMARC is viewed with suspicion by all major email providers. Since November 2025, Google no longer simply filters non-compliant messages as spam: it rejects them at the SMTP level.
Using spam trigger words in the subject or body of the message. Terms like "free," "urgent," "exclusive offer," "click here," or the excessive use of capital letters and exclamation points increase the risk score assigned to your email by filters. Write your subject lines like you would write an article title: informative, concise, and straightforward.
Send emails composed solely of images. An email without text is considered suspicious by spam filters, which cannot analyze its content. Maintain a balance between text and images, and ensure your images have alt tags.
Use shortened links. URL shorteners mask the link's true destination, immediately raising red flags for filters. Use direct and transparent links.
Do not manage inactive individuals. Regularly sending emails to contacts who never open them damages your sender reputation. Email providers interpret a lack of engagement as a negative signal. Remove or re-engage your inactive contacts before they become a problem.
Abruptly changing the sending volume. Going from 500 emails per week to 50,000 in a single campaign will raise red flags for algorithms. If you need to increase your volume, do so gradually, over several weeks.
Not regularly checking if your domain is blacklisted. Tools like MXToolbox or Spamhaus's reputation check service allow you to monitor your reputation. Being blacklisted can go unnoticed for weeks if you don't actively seek help.
FAQ: Your questions about email marketing software
Can you use your email marketing software to send emails to B2B prospects without their prior consent?
In B2B, the law provides a nuance: email marketing can be based on legitimate interest if the message is directly related to the recipient's professional role. However, this exception does not exempt companies from complying with GDPR obligations: transparency regarding data use, a simple and functional right to object, and a data retention period limited to three years. In case of doubt, prior consent remains the strongest and most defensible legal basis.
What is the difference between a hard bounce and a soft bounce?
A hard bounce is a permanent delivery failure: the address doesn't exist or the domain is invalid. These addresses must be removed from your list immediately. A soft bounce is a temporary failure: the recipient's mailbox is full, or the server is temporarily unavailable. Your email marketing software will attempt to resend the message automatically. If soft bounces occur repeatedly for the same address, treat them as hard bounces.
How often should an SME send out campaigns?
There's no one-size-fits-all frequency. The right frequency is the one your contacts accept without unsubscribing or marking you as spam. A monthly newsletter is a reasonable starting point for many SMEs. More frequent campaigns are possible if the content provides real value in each email. Monitor your unsubscribe rate: if it increases after a frequency change, that's a clear sign.
Can my email marketing software replace my CRM?
No, and the confusion between the two is common. Email marketing software manages sending messages to contact lists and measures engagement. A CRM manages the customer relationship in its entirety: interaction history, sales pipeline, quote and contract management, and project tracking. The two tools are complementary and should ideally be connected so that data flows between them. Some solutions offer both functions in a unified interface, which can simplify management for an SME that doesn't want to use multiple tools.
Djaboo is an all-in-one CRM tool designed for French micro-businesses and SMEs. It centralizes customer relationship management, invoicing, project management, and marketing automation in a single interface, requiring no technical skills. More than 1,000 teams use it daily to structure their processes and increase productivity.
