Designed for cloud computing

There was not much movement happening in vSMTP for a few months, as we were working behind the scenes on the third version of vSMTP with a completely new architecture.

We rebuilt the server from the ground up, moving from a monolithic architecture to a micro-service architecture, using AMQP as the main way of communication between services.

A new architecture

Since then we did great optimizations, the transition to a micro-service architecture was the major shift in how vSMTP version 3 is structured. This change involved breaking down the server into smaller, more manageable services, each responsible for specific functions.

The micro-service architecture offers benefits such as scalability, flexibility, and easier maintenance.

RabbitMQ and AMQP

Using AMQP (Advanced Message Queuing Protocol) and RabbitMQ as vSMTP messaging infrastructure was an obvious choice.

RabbitMQ acts as a message broker, facilitating the exchange of messages between different vSMTP services. It provides features such as message queuing, routing, and load balancing, which improve the reliability and scalability of vSMTP.

Microservices, AMQP and cloud computing

Microservices architecture and the use of Advanced Message Queuing Protocol are well suited to cloud computing for several reasons, as they align with the key principles and benefits of cloud-based applications:

  • Scalability and elasticity
  • Resource allocation and efficiency
  • High availability and fault tolerance
  • Global reach

In summary, microservices architecture and cloud computing naturally complement each other due to the alignment of their fundamental principles and capabilities.

The combination of vSMTP’s new internal architecture with the scalability, flexibility, and managed services of cloud platforms enables messaging service providers to build and operate modern, resilient, and efficient infrastructures that can meet the demands today’s dynamic and evolving business environments.

You can right now download the release candidate on GitHub. Our teams will be happy to guide you during your installation.

Stay tuned. Join us on Discord, X and LinkedIn.

A rocket is launched


An astronomical number – 350 billion emails per day routed and analyzed by software built in the 90s.

The numerous energy and environmental crises have made us aware that any new IT product must be designed with the major objective of reducing the environmental footprint. It is on this premise that the vSMTP project was born in 2020.

Since its first releases in 2021, vSMTP is certainly one of the fastest MTAs in the world.

Early vSMTP 1.01 version compared to Postfix 3.6

Since then we did great optimizations, but, when considering an MTA in 2023, its intrinsic performance is not the only quality to take into account. It must be easily usable and configurable. The vSMTP version 2 specifications met these criteria by providing an advanced scripting language as well as a very easy to use rules system.

Version 3

We wanted to go further, and design a new version capable of integrating into a world where cloud computing reigns supreme and where companies’ commitment to CSR has become mainstream.

The viridIT teams have worked hard to answer them and I am proud to announce the release of version 3 of vSMTP at the beginning of October. This major release brings a completely new architecture based on microservices.

You can right now download the release candidate on GitHub. Our teams will be happy to guide you during your installation.

Stay tuned. Join us on Discord, X and LinkedIn.