Espero-Soft × Bjet24: the mail API as a reusable building block

Espero-Soft, the studio that builds business software

Espero-Soft is a Belgian software studio. Its craft: designing custom management applications for businesses — CRM, ERP, industry platforms, internal tools. On every project, the same question comes up: how will the application send mail?

Because almost every management system eventually has to produce paper.

The challenge: not rebuilding postal mail on every project

Printing, enveloping, franking, dropping off at the post office, collecting proofs: that is an entire infrastructure. Rebuilding it for each client — or worse, letting each client handle it by hand — meant wasted time and a source of bugs.

Espero-Soft needed a reusable postal-mail building block: the same one regardless of the project, ready to plug in.

The solution: Bjet24 as the standard mail layer

Espero-Soft made the Bjet24 API its default postal-mail layer. On every new project where the client needs to send mail, the team now develops only the business logic — which document, which recipient, which trigger. Printing, franking, drop-off and tracking are delegated to Bjet24.

The test environment (sandbox) plays a key role here: developers integrate and validate the entire sending flow without printing a single sheet, then switch to production once the project is ready.

One model, several projects

A billing application triggers the postal sending of invoices and reminders.
An HR tool sends contractual letters and certificates.
An industry platform dispatches regulatory notifications as registered mail.

In all three cases it is the same integration, the same provider, the same way of collecting proofs. What the team learns on one project applies directly to the next.

What it brings the studio

Time-to-market: postal mail is no longer a feature to build, but one to plug in.
Reliability: a proven infrastructure rather than a homemade script per client.
Controlled cost: no porting, no printer maintenance or postal logistics.
Consistency: the same integration quality across every piece of software delivered.

In summary

For Espero-Soft, Bjet24 has become a standard component of its toolbox. The studio focuses on what makes software valuable — its client's business logic — and leaves postal mail to an API built for it. One less building block to reinvent, on every project.

Frequently asked questions

Does Espero-Soft build a new mail integration for every client?

No. Espero-Soft standardized the Bjet24 API as its postal-mail layer. On each project, only the business logic — which document, which recipient, which trigger — is developed; printing, franking and tracking stay the same from one project to the next.

How do the developers test without sending real letters?

Through Bjet24's test environment (sandbox). Mailings go through the same status cycle and fire the same webhooks as in production, but nothing is actually printed or dropped off. The switch to production happens once the project is validated.

What kinds of applications integrate Bjet24 at Espero-Soft?

Any management software that has to produce paper: billing, HR, industry platforms. Uses range from invoices and reminders to regulatory notifications sent as registered mail.