Why ISO/IEC 27001 Will Be a Hot Topic as Early as 2026
When choosing a certified digital mail carrier, the decision will soon no longer be based solely on whether it can deliver an invoice.
Starting in 2027, ISO 27001 and the digital postmaster will become issues that companies will not be able to ignore when it comes to e-invoicing.
If it operates as a certified digital mail carrier in the Peppol network, it will also need to demonstrate the maturity of its security management.
That is precisely why it doesn’t pay to limit your choice of partner to functionality alone. Today, a company needs more than just someone who will send an XML invoice in the right direction. It needs a certified digital mail provider capable of secure delivery, operations, incident logging, integrations, and reliable growth for years to come.
So if you’re considering which digital mail provider to choose today, it makes sense to ask not only about functionality, but also how well the digital mail provider is prepared for OpenPeppol’s new security requirements and what this will mean for customers after July 1, 2027.
The selection of a digital postmaster will begin to change as early as 2026
On the surface, it may seem that 2027 is the decisive year. In reality, however, the situation will change sooner than that.
Slovak companies are preparing for mandatory e-invoicing starting in 2027 (https://postarflowis.sk/e-invoice-≠-pdf-what-exactly-will-be-mandatory-as-of-jan-1-2027/), but at the same time, regulations for digital mail providers on the Peppol network are also becoming stricter.
OpenPeppol (https://peppol.org) has confirmed that ISO/IEC 27001 will be mandatory for all certified providers as of July 1, 2027.
This is an important change even for companies that are just in the process of selecting a digital mail provider. If you choose a partner that currently makes a strong business case but lacks a realistic roadmap to certification, you could find yourself facing unnecessary operational risk in a few months.
With e-invoices, it’s no longer enough for a digital mail carrier to be able to send XML
When people talk about e-invoicing, a large portion of the market still thinks primarily of the invoice format, integration with ERP systems, and the delivery process itself. That’s only part of the picture.
In practice, the digital mail carrier also processes partner identifiers, integration flows, status reports, technical logs, and operational data.
When it comes to mandatory e-invoicing, a response like “Yes, we can send it via Peppol” is no longer sufficient. The company also needs to know how the digital mail provider handles access, changes, monitoring, incidents, and dependencies.
Where ISO/IEC 27001 Comes Into Play
ISO/IEC 27001 is not just a marketing label.
It is a safety management system.
From the customer’s perspective, this signals that the digital mail provider addresses security systematically—with checks, audits, and a clearly defined scope.
4 Questions That Reveal How Prepared a Digital Mail Carrier Is
Do you have ISO/IEC 27001 certification, or are you still in the process of obtaining it?
What stage of the certification process are you in?
How do you handle incidents, monitoring, and logging?
What are your dependencies on the cloud and vendors, and how do you manage them?
What does this mean for Slovak companies?
In Slovakia, the discussion on this topic is often narrowed down to the issue of legislation alone.
At the same time, however, a second issue is emerging—the readiness of digital mail carriers.
You can find more context on who is affected by e-invoicing in other blog posts.
For a company, this means that it is not enough to focus solely on the EN 16931 standard or integration with an ERP system.
We also need to consider the security model.
What to Look Out for When Comparing Offers
When comparing solutions, it’s worth noting:
- if everything boils down to just technology
- if the certification is unclear
- when there is pressure to make a quick decision without discussion
It may also be helpful to look at the broader context of solutions and projects:
https://postarflowis.sk/projekty