OPEN SOURCE

No more black boxes

Enterprise-grade email performance with the freedom, flexibility,
and innovation only Open Source can offer
OPEN SOURCE

No more black boxes

Enterprise-grade email performance with the freedom, flexibility,
and innovation only Open Source can offer

Open Source that means business

With digital transformation and AI driving the next wave of business innovation, organizations are prioritizing agility, scalability, and control. Locking into proprietary MTAs or high-cost commercial platforms can limit that freedom — a risk today’s forward-thinking companies are unwilling to take. From agile start-ups to global enterprises, organizations are choosing KumoMTA because its open source model provides unmatched cost efficiency, flexibility, and innovation.
And while to the uninitiated using software freely available to everyone may sound like a risky proposition, the fact that everyone has access to the source code doesn’t reduce quality, it raises it. In commercial software, only the vendor’s internal team reviews code, so vulnerabilities can remain hidden for years — either through oversight or lack of disclosure — until they are exploited by external bad-actors or flagged by their customers themselves.
This transparency is why leading enterprises like Red Hat (IBM), Canonical, Elastic, Cloudera, and HashiCorp have built multi-billion-dollar businesses delivering secure, enterprise-hardened open source. And it’s why mission-critical infrastructure—from Linux, which powers nearly every major cloud provider, to Kubernetes, maintained by the Cloud Native Computing Foundation—relies on open source as its foundation.
With KumoMTA, thousands of independent developers, security researchers, and enterprises can audit the same code, increasing the odds that flaws are caught and fixed quickly. This is especially important in today’s business environment, where companies are frequently acquired and business models shifted to focus on maximizing short-term revenue generation, making maintaining consistent oversight a challenge at best, and deprioritized at worst. KumoMTA’s open-source model provides a stable, transparent foundation that isn’t tied to a single vendor, team, or individual—its broad community and governance ensure continuity, accountability, and security even as the commercial landscape shifts.
For organizations from emerging disruptors to specialized email service providers to the largest global enterprises, the need to integrate seamlessly into enterprise-grade and AI-first workflows is paramount. Our completely reimagined architecture was built with this need in mind, providing significant advantages over re-architected or pre-existing commercial offerings.
KumoMTA was purpose-built to be:

check You own the product. Unlike subscription models where access is contingent on continued payment and you can lose access due to license issues, consolidation, or strategic shifts.

check Ensured continuity and operability. No matter what changes might occur—in Kumo’s product roadmap, partnerships, the broader industry, or even our corporate structure—you will always retain full access to and complete control over your implementation of KumoMTA.

check Unrestricted freedom to customize, modify and integrate with other solutions.

Cost

check Predictable, fair pricing for services and support at a significant savings over commercial providers. KumoMTA customers will never get hit with sudden price hikes.

Visibility & Control

check No more black boxes. With source code hosted on Github, you have clear insight into our code base.

check No hidden backdoors. Unlike proprietary software, open-source code can be verified line by line.

check Transparency builds trust. You can audit the code yourself or use automated tools to verify its safety.

Kumo’s Community = innovation and security

check Expedited vulnerability identification by a community of thousands of independent developers, security researchers, and enterprises continually auditing code and identifying improvements.

check “Many eyes” principle. With a large, active community, bugs and vulnerabilities can be found and fixed faster than in commercial software.

check Continuous development. The KumoMTA community helps make us better every day, with official new releases happening regularly.

TomK
Tom Kulzer
AWeber

“The fact that it was Open Source made the purchase decision to go with KumoMTA much easier.“

Read the case study