In 2026, retaining customers has become a true balancing act. With the proliferation of available channels, increasing pressure on deliverability, and audiences being solicited more than ever, CRM teams must juggle complex trade-offs. I often ask myself this question: how to choose the right channels among email, instant messaging, push notifications, and SMS? The answer is not simple, as each channel has its strengths and weaknesses. What works for a B2B company may not suit an e-commerce business. What generates spectacular results in January may fizzle out by June. The important thing is to understand that the retention strategy must be tailored to your specific context, your customers, and your business objectives. In this article, I share insights that untangle misconceptions and pitfalls to avoid in order to build a sustainable customer relationship on solid foundations in 2026.
📋 Summary
The Proliferation of Channels: A Strategic Challenge
The proliferation of channels is not necessarily a problem in itself if we consider the recipient’s perspective, who can choose what they prefer. Where it gets complicated is on the brand side: the campaign manager must juggle between channels, tools, and orchestrate everything coherently. I see many companies diving into all channels at once without really thinking about their overall strategy. This is a common mistake. The prioritization of channels should follow a simple logic: cross-reference costs, time spent by teams, and measured effectiveness. Testing is essential, but with caution, as one-off tests tend to overperform and can skew the interpretation. Over-solicitation is a structural problem that has persisted for years, and no one has yet found the miracle solution. Predictive approaches based on AI offer great promises 🤖, but they do not exempt you from working on the substance: truly relevant messages, well-targeted, crafted with care.
What I recommend to companies is to start by auditing their current channels. Which ones generate the best ROI? Which ones consume the most resources? Once this analysis is done, you can decide to optimize existing channels before adding new ones. Channel management is a continuous exercise that requires regular adjustments.
Email Marketing: Still the King of Retention
Email is primarily the most entrenched retention channel in practice. Its advantages are undeniable: very low sending cost (no “stamp” to pay to Meta or telecom operators), high level of personalization, possibility of very refined design work, extremely broad ecosystem of tools, mature uses. I could list many more. Its status is clearly undisputed, even though the question arises regularly. Channels accumulate, each with its specificity, without erasing the previous ones. Email has not been killed by SMS, nor by mobile notifications, nor by social media. It will not be further threatened by WhatsApp. The dominance of email persists because it is a reliable and controlled channel.
What is often underestimated is the major strategic advantage of email: it is the only channel where the brand truly owns its list. No third-party algorithm, no intermediary platform that can cut access overnight. It is an asset that belongs to the brand, giving it a strategic value that other channels simply do not have. When you use WhatsApp or Facebook, you build your audience on ground that you do not own. With email, you own your list 📧. This is a fundamental difference that explains why email remains central to any serious retention strategy.
I recommend to my clients to consider email as the foundation of their CRM strategy. It is the channel to invest in first, the one that offers the best long-term return on investment. Other channels come as a complement for specific uses. The hierarchy of channels should place email at the top.
WhatsApp and Instant Messaging: Conversational Efficiency
Instant messaging has the advantage of being… instant, and has entered the usage of a large majority of the population. It is an excellent example of what I mentioned about the specificities of each channel, with tools that excel in conversational aspects: quick responses, real-time order tracking, responsive customer service. This is something that email handles less well by nature. I see more and more companies using WhatsApp for customer support, and the results are often impressive in terms of customer satisfaction. People respond faster, conversations are more natural. But there are significant limits to consider. First, the cost: Meta imposes its rates, and they can change. But above all, these channels are closed and centralized. You depend on a single player who holds all the infrastructure and can change the rules overnight. This is precisely the advantage of email and, to a lesser extent, SMS: they are open and decentralized channels. No single player can cut your access to your audience. The sovereignty of data is a crucial issue.
There is a real question of sovereignty behind the choice of CRM channels. Relying exclusively on WhatsApp or Messenger means building your customer relationship on ground that you do not own. I always advise a balanced approach: use WhatsApp for what it does well (conversational, support), but do not put all your eggs in one basket. Instant messaging is excellent for one-off interactions 💬, but it does not replace a solid email strategy. It is a complement, not a substitute.
For companies considering using WhatsApp on a large scale, I recommend starting with limited use cases: order confirmations, delivery tracking, customer support. Test, measure, then decide if you want to expand. The gradual integration of instant messaging is the best approach.
Deliverability: The Often-Neglected Technical Challenge
A well-written, well-segmented email that ends up in spam is often the nightmare of many brands. What are the levers to ensure that an email reaches its target in 2026? The basic principle for good deliverability remains respect for consent. Technical prerequisites (authentication, DNS record configuration, IP reputation) are necessary but never sufficient. In deliverability, reputation is primarily built on the behavior of recipients towards the emails received. Certain interactions negatively impact: spam complaints, bounces, total lack of openings. Others have a positive impact: high open and click rates, responses to emails. ISPs and webmails continuously observe these signals to evolve your sender reputation and decide where your message lands. I see too many companies neglect this technical aspect, thinking it is the IT department’s responsibility. This is a mistake. Deliverability management is a strategic issue that must involve the entire marketing team.
The main levers are therefore to ensure that your targets genuinely want to receive your emails, which starts with quality acquisition, and not to let inactive recipients accumulate in your lists. Continuing to send massively to contacts who haven’t opened in months is the best way to degrade your reputation. Stopping sending to these inactive recipients is not a loss; it is a good way to improve your performance 📊. Deliverability is a strategic topic, not just technical. I recommend my clients conduct a deliverability audit at least once a year and establish regular list cleaning processes.
Another often-overlooked dimension: the importance of authentication. SPF, DKIM, DMARC are not just technical acronyms. They are the foundations of your sender reputation. Without these elements correctly configured, even your best emails risk ending up in spam. The technical infrastructure of email is as important as the content itself.
AI in Emailing Tools: Beyond the Gadget
Emailing tools are increasingly equipped with AI features for personalization, segmentation, or even content generation. Does this really change the game for retention? Let’s be honest: the first AI features that appeared in emailing tools were more of a gadget than a revolution. They had to follow the trend, so platforms released what was necessary to avoid appearing outdated. But in 2026, uses are becoming clearer and really interesting. The most structuring aspect: the automation of orchestration. We see more and more platforms offering their clients the ability to design messages for different objectives and letting the tool decide when and to whom to send them. The promise is appealing and not so new in its formulation. It is the old mantra of direct marketing, the right message to the right person at the right time, finally equipped to materialize on a large scale. I am optimistic about this evolution 🚀, as it allows marketing teams to focus on strategy rather than execution.
Another major topic: agentic AI. Agentic AI is starting to integrate into the most advanced CRM solutions. The idea: to be assisted by autonomous agents capable of designing complete campaigns, from message drafting to results analysis. But these agents must be framed by strict business rules. The teams that pilot them need more than ever a solid strategic vision and serious work on governance: editorial charter, graphic charter, clear definition of KPIs. AI amplifies what exists; it does not replace reflection or well-defined strategic objectives. I see too many companies thinking that AI will solve all their problems. This is not the case. AI is a tool, not a magic solution. AI governance in marketing is a major issue for 2026.
For companies considering adopting these new AI features, I recommend starting with simple and measurable use cases. Test on a small audience, measure the results, then decide to expand. Do not launch an agentic AI campaign across your entire database without first testing. The gradual experimentation is the key to success with AI.
The Ideal Combination of Channels for 2026
If you had to define the ideal combination of channels for retention in 2026, what would it be, and why? The ideal combination does not exist. The strategy for using channels entirely depends on the context: where your contacts are, and what types of interactions your business requires? That said, regarding customer relationship channels, I believe we should prioritize maturity and costs. We first rely on email and SMS for all suitable uses. These are proven, controlled channels, with an excellent cost/effectiveness ratio. Then, if we lack email addresses, if we need to generate conversation, or if we have a mobile app, we look into other channels. And, in all cases: we must test, measure, and verify what is coherent for our own contacts. Without succumbing to current trends. I see too many companies adopting a new channel just because it is fashionable. This is a mistake. Contextual relevance should guide your channel choices.
My personal recommendation for an SME in 2026: start with email. Invest in a good platform, build a quality list, master deliverability. Once you have a solid foundation, add SMS for urgent messages or flash promotions. Then, if your audience justifies it, explore WhatsApp for customer support. This progressive approach allows you to master each channel before adding a new one. Methodical progression is more effective than a scattergun approach.
For large companies, the situation is different. You can afford to experiment with multiple channels in parallel. But even in this case, I recommend clear governance: who manages which channel? What are the specific objectives? How do we measure success? Without this clarity, you risk ending up with channels that cannibalize each other or send contradictory messages. Multi-channel orchestration is an art that requires discipline.
Training on CRM and Email Marketing Issues in 2026
Mastering these channels and their most technical aspects requires skills that evolve quickly. For someone looking to train in email marketing or CRM in 2026, where would you recommend starting? I’ll start with the obvious answer: following specialized blogs and newsletters is a good starting point. But to truly become an expert, you need to know how to step off the beaten path. This involves in-depth articles, on the fringes of the expertise you are building. Not ultra-generic content designed for SEO. This is particularly true for deliverability, an area where AI is still often off the mark: the subtleties of reputation, ISP behavior, and infrastructure warm-up cannot be summarized in a few broad rules. I therefore recommend following niche blogs and, above all, joining communities where real expert discussions take place. For everything related to email marketing, the Slack EmailGeeks is, for me, an essential reference 👥. This is where real experts exchange, share their experiences, and discuss the latest trends.
Beyond online resources, I also recommend seeking a mentor or an expert who can guide you. Email marketing and CRM are fields where experience counts a lot. Learning from others’ mistakes is more effective than making them yourself. Finally, do not forget that the best training is practice. Launch campaigns, measure results, adjust, and restart. It is by doing that we truly learn. Continuous learning is essential in this rapidly evolving field.
For those who want more structured training, there are certifications in email marketing and CRM. They can be useful for validating your skills and giving you credibility with your employers or clients. But do not consider them as the end of your learning. It is just a starting point. True expertise is built over time, through experience and constant curiosity.
Conclusion
In 2026, customer retention is not about choosing a single channel, but about building a coherent strategy that intelligently combines multiple channels. Email remains the foundation, thanks to its reliability, low cost, and list ownership. Instant messaging like WhatsApp excels in conversational and support aspects. SMS remains relevant for urgent messages. And AI is beginning to transform the way we orchestrate these channels. Too many companies think that adopting a new tool or platform will solve their retention problems. This is not the case. Technology is a means, not an end. What really matters is having a clear vision of your objectives, understanding your customers, and choosing the channels that fit your context. I am convinced that the companies that will succeed in 2026 will be those that have mastered the fundamentals (email, SMS) while intelligently exploring new opportunities (AI, instant messaging). It is a delicate balance, but it is the one that pays off.
📝 In Brief
- Email remains the most reliable and cost-effective retention channel in 2026, thanks to its ownership and low cost
- WhatsApp and instant messaging excel in conversational and customer support, but create dependency on third parties
- Deliverability is a strategic issue that requires constant attention and good list hygiene
- AI transforms campaign orchestration, but it amplifies what exists rather than replacing strategy
- The ideal combination of channels depends on your context: start with email and SMS, then explore other channels gradually
- Continuous training and learning from experts are essential to mastering these ever-evolving issues
