KumoMTA isn't just Open-Source, it's better by design.
Complete Control
KumoMTA is designed around the belief that the user should have control of all decisions, with very little assumption out of the box. Use our standards-based Lua scripting engine to make it your own.
Modern Deployment
Fresh builds for Amazon Linux, Rocky Linux, Ubuntu, and Docker with every update.
Modern Integration
Your MTA no longer needs to be a black box. KumoMTA supports API injection/management, webhooks, AMQP, Kafka, secure keystores, and data-source-based configuration.
Safe Performance
KumoMTA is not only capable of relaying millions of messages per hour, it does so without shortcuts like RAM spooling. The speed you need, without the risk of data loss.
Automated Traffic Shaping
Automate your adherence to sending requirements. Thanks to our Lua-first configuration and automation design, you can adjust throttles, pause and resume traffic, and automate IP warmup. KumoMTA even supports rules on a per-tenant basis.
Cloud Friendly
With flexible deployment options, support for containers, clustered throttles, HAProxy and SOCKS5 proxies, KumoMTA was built for those wanting to deploy in the cloud.
Native Campaign Awareness
KumoMTA is natively aware of both campaigns and tenants, queueing them separately and enabling granular configuration and reporting. Tenants and IPs are de-coupled, providing a superior shared IP experience.
Automatic MX Rollup
Say goodbye to fractured configurations and out of date domain mapping tables, KumoMTA automatically identifies MX groups and queues messages together for common throttling and delivery.
Natively OmniChannel
KumoMTA not only supports IP pooling natively, but it's also built around channel extensibility, with support for HTTP, Kafka, and AMQP delivery of messages already available with more channels on the way.