Why the market has not created a universal digital mailbox on its own

It is a fair question. A more universal model could reduce fragmentation, improve trust, simplify delivery, and make digital communication easier for both senders and recipients. But good system outcomes do not always emerge on their own. In digital communication, what makes sense for the system is not always what makes sense for each market participant. The white paper The Case for a Universal Postal Digital Mailbox developed by Copenhagen Economics with e-Boks makes this point clearly: recipients generally benefit from a shared access point, but senders, postal operators, and policymakers often face mixed incentives that pull in the opposite direction.

That is why the market keeps producing fragmented solutions.

Fragmentation can be a rational choice

From the outside, fragmented communication can look inefficient. And in many ways, it is. But from the perspective of an individual organisation, building or maintaining a proprietary channel can still be a rational decision.

Large senders often want control. They want control over branding, user journeys, authentication, customer data, and engagement. If they already have a large digital customer base, a proprietary platform can feel like the most efficient option. Instead of relying on an external mailbox provider, they can keep communication within their own environment and use that same environment to drive payments, subscriptions, customer service, and product interaction.

That creates a basic tension. What is efficient for one sender may create complexity for everyone else.

Why senders do not automatically choose a shared mailbox

Senders generally want to digitise communication. That part is not in doubt. Digital delivery is faster and cheaper than physical post. The harder question is whether they want to use a shared digital mailbox or keep communication in-house.

The answer depends on scale. For large senders, proprietary systems can make economic sense because high volumes justify the fixed cost of building and maintaining them. Smaller senders may be more likely to use an external provider because they do not have the same traffic or infrastructure.

There is also a trade-off between reach and control. A shared mailbox may improve visibility because recipients are more likely to check one recognised channel than five different ones. That can reduce missed messages, repeated reminders, and support costs. But in-house channels often give senders something a shared system cannot fully match: direct access to data on customer behaviour, response times, payment patterns, and engagement. That data can be valuable for targeting, risk assessment, and customer management.

So even when a universal mailbox could improve overall communication efficiency, individual senders may still prefer to keep the relationship inside their own walls.

Postal operators face a mixed business case too

It is easy to assume postal operators would naturally want to lead the transition to digital communication. In reality, their incentives are mixed as well.

On one side, digital mailboxes are strategically attractive. They allow postal operators to remain relevant as letter volumes decline. They can create new digital services, strengthen sender relationships, and build on capabilities many operators already have. In that sense, investing in digital communication can be a way to protect long-term relevance.

On the other side, the short-term business case can be difficult. Digital letters often generate far less revenue than physical mail. For operators with large physical mail volumes, moving too quickly into digital can cannibalise an existing revenue stream. And while digital delivery reduces operating costs, it also requires investment in new infrastructure, product development, security, and go-to-market effort.

There is another challenge too: timing. A digital mailbox is a two-sided model. It becomes more valuable when both senders and recipients use it, but it is hard to get both sides to adopt at the same time. That creates demand uncertainty. If the market is not yet mature, early investment carries risk.

So even for postal operators, the case is not simply yes or no. It is a balancing act between protecting existing business, investing for the future, and judging whether the market is ready.

Policymakers want coordination, but not at any cost

Governments have some of the strongest reasons to want a more coordinated communication model. Public authorities send large volumes of important messages, and fragmented communication makes the state harder to navigate. A common mailbox can reduce duplication across agencies and create a simpler experience for citizens and businesses.

But policymakers face trade-offs too.

One concern is inclusion. Physical letters remain important for many people, especially older citizens and those with limited digital access or confidence. Strong digital mandates can therefore become politically sensitive if they are perceived as reducing access rather than improving it. Another concern is competition. If one provider becomes the default channel for essential communication, governments may worry about lock-in, reduced innovation, or overdependence on a single provider.

That means policymakers often sit in a difficult position. They may recognise the value of a more universal model but still hesitate to push too hard if the political, regulatory, or market conditions are not right.

The problem is not demand. It is alignment

This is really the core issue. The barrier is not that nobody wants better digital communication. It is that the incentives are not aligned.

Recipients benefit from simplicity, predictability, and trust. But recipients are not usually the ones designing the infrastructure.

Senders want efficiency but also control. Postal operators want to stay relevant but may be cautious about investment and revenue trade-offs. Policymakers want coordination, but must also manage inclusion, competition, and public trust.

Each actor has a rational perspective. Together, those rational perspectives can still produce a fragmented outcome.

That is why a universal digital mailbox is not something the market will necessarily create on its own, even if the long-term case is compelling. According to the Copenhagen Economics and e-Boks white paper, the development of a universal model depends on whether market incentives and policy frameworks can be brought into better alignment.

 
Why these matters

This question matters because fragmentation is not just an inconvenience. It affects the quality of digital communication itself. It influences whether important messages are seen, trusted, acted on, and stored properly. It shapes whether digital interaction feels coherent or scattered.

A universal model may create value for everyone, but that does not mean everyone is equally motivated to build it. Until those changes, fragmentation will continue to be the default outcome.

And that is why the future of digital communication is not only a matter of technology. It is also a matter of incentives.