kumomta
The premium Open Source alternative to SendGrid
🎯 Best for:Organizations sending millions of emails daily.
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%