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Fast, Flexible, Open-Source

The best MTA for
Enterprise Senders

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Fast

KumoMTA is architected for the performance needed by enterprise senders, whether it's sending several million messages per hour through a single server, or scaling horizontally using Docker and Kubernetes.

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Flexible

KumoMTA can replace straightforward configurations or be deeply integrated into your MailOps environment thanks to our Lua scripting engine and support for technologies including webhooks, AMQP, Kafka, Vault, Prometheus, Grafana, and direct database access.

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Open-Source

KumoMTA is released under the Apache 2 OSI-approved license, with the ultimate transparency of having our sourcecode hosted on Github. Our community is actively involved and contributing to make KumoMTA better every day.

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Making KumoMTA Possible For All

Our Sponsors

CASE STUDIES

Our Growing Community

42000 +

Lines of Source Code

250 +

Pages of Documentation

200 +

Discord Members

160 +

Stars on GitHub

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Our Users

BenDyer

Taguchi Marketing

Ben Dyer

"We’ve known Kumo’s founders and worked with them for many years, That personal connection was critical.

The fact they’re involved was enough to get us over the line to becoming a customer."

Our Partners

ongage logo
Integration Partner

Ongage

Ongage is an email marketing platform that helps your business to personalize engagements and drive conversions through data.
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postmastery
Services Partner

Postmastery

Postmastery is a leader in email deliverability and infrastructure management. They offer professional tools for email delivery and monitoring, enabling legitimate email senders to optimize their infrastructure and practices for email marketing and transactional email applications.
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edgeneering-1
Services Partner

Edgeneering

Edgeneering LLC is a Web Development and technology company specializing in software & database development, high security data center hosting, and Open-Source consulting services.

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Our Latest Blog Posts

MTA, On-Prem, KumoMTA, Open-Source

Where the money goes

The world is changing. There is a quiet revolution going on right under our noses. It has been building for years and...
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MTA, On-Prem, KumoMTA, Open-Source

Moving Beyond IP Reputation

NOTE: This post was originally written for Spam Resource, the initial publication can be seen at...
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MTA, On-Prem, KumoMTA, Open-Source, microsoft, FUD

Setting the Record Straight

“First they ignore you, then they laugh at you, then they fight you, then you win.”
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Choose the Best MTA

Find out more about how you can break free of the commercial license trap while leveraging the best MTA for enterprise senders.

Let's Talk

Chat with our founders and learn how easy it can be to move to KumoMTA.