kumomta

The premium Open Source alternative to SendGrid

🎯 Best for:Organizations sending millions of emails daily.
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Apache-2.0License

What is kumomta?

Replaces legacy MTAs like Postfix or commercial services like PowerMTA. Written in Rust for high-concurrency throughput and policy-driven message routing in massive environments.

Tech Stack
RustMarketing & SEO

Why kumomta?

  • Extreme performance
  • Modern Rust codebase
  • Flexible Lua policies

Limitations

  • High technical barrier
  • No built-in GUI
  • Complex IP warming
3/5/2026
Last Update
83
Forks
67
Issues
Apache-2.0
License
Financial Leak Detected

Stop the "SaaS Tax"

Your team could be burning cash. Switching to kumomta instantly boosts your runway.

Competitor Cost
-$1,440
/ year (est. based on SendGrid)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%

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