The digital mail carrier is certified: what does this mean for e-invoicing in Slovakia?

E-invoicing in Slovakia is rapidly shifting from a “to-do later” issue to a practical obligation that companies will need to address sooner and in more concrete terms. When preparing for the new rules, therefore, it’s no longer just a matter of whether you send invoices electronically, but also of what infrastructure you’ll use to securely send and receive them.

That is precisely why this news is important: Flowis s.r.o., the operator of the Digital Postman solution, has been included in the official list of certified delivery service providers for electronic invoicing operating in the Slovak Republic.

What does “certified delivery service provider” mean?

With e-invoicing, it’s not enough to simply “send” an invoice. The rules for e-invoicing in Slovakia are set up so that e-invoices are delivered through certified delivery service providers—that is, digital mail carriers—who ensure secure and standardized transmission between the sender and the recipient.

For businesses, this means, in particular:

• It’s not just about sending a PDF via email,
• A reliable method of delivery is important,
• The system must be able to process structured e-invoices,
• and the process must be ready to operate in the official e-invoicing environment.

Why Certification Is Important in Practical Terms, Too

When a company is implementing e-invoicing in Slovakia, it generally doesn’t want to delve into the technical details of the network, standards, and certifications. What it needs to know above all is whether the solution it chooses will be practical and whether it is built on the right foundation.

In this regard, certification is an important indication that the provider is part of the officially registered framework for the delivery of e-invoices in Slovakia.

For the customer, this provides greater assurance that:

• is preparing for e-invoicing through the relevant channel,
• does not invest in a dead-end branch,
• and the solution is aligned with the guidelines set by the Financial Administration of the Slovak Republic.

What does this mean for Digital Mailbox users?

If you’re thinking today about how you’ll receive and send e-invoices starting in 2026 and 2027, it’s not just the functionality that matters, but also the reliability of the solution you choose.

For users of Digitálny poštár, this means that Flowis isn’t just a company that talks about e-invoicing or plans to support it. It’s a company that is already listed on the official roster of certified delivery service providers.

This is especially important for companies that want to:

• start preparing early,
• avoid last-minute improvisation,
• and have a partner who is ready to operate effectively within the Slovak e-invoicing environment.

E-invoicing in Slovakia isn’t just about legislation. It’s also about infrastructure.

Many companies today are primarily concerned with the question of who will be affected by this requirement and when it will take effect. However, a second question is just as important: what platform will the invoices actually go through?

And this is where the digital mail carrier comes into play. For e-invoicing to be reliable, automated, and usable in everyday practice, it needs a solid delivery foundation.

Do you want to be ready in time?

Flowis’ Digital Mailman helps companies prepare for e-invoicing in a practical way: without unnecessary chaos, with an emphasis on simplicity, automation, and readiness for new regulations.

Still not sure if e-invoicing applies to you? Find out in 60 seconds.