KumoMTA

The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

Data confidence90/100
Source coverage90/100
Publish confidence90/100
Evidence checkedSep 11, 2026
About this tool

What ToolVitals knows about KumoMTA

The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

This tool has an OSI-approved open-source license signal.

Commit continuity, contributor activity, and delivery signals are strong.

Source-visible projectSelf-Hosted Email ServerOSI-approved OSSScored Intelligence
Score Breakdown

Public signal read

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How to read this

The overall score reflects ToolVitals maintenance and delivery evidence. Adoption is shown as public context only and does not change the overall score.

Activity
Commit activity across recent and sustained windows, with releases as a small supporting signal.
Reliability
Maintenance posture from commit recency, continuity, and active contributors.
Adoption
Public footprint from GitHub stars and forks when available.
ToolVitals89/100Health91/100Shipping86/100Zombie Risk2/100
Overall Score89Active
Activity86
Reliability91
Adoption53
Project provenance

Fork network

Popular active forks

Highest GitHub star count first
Repository

GitHub Activity

RS
KumoCorp/kumomta
Stars530
Forks102
Contributors7Active in 90d · as of Sep 11, 2026
Open Issues91
Primary Language
Rust
Last Commit
Today
Commits 30d
14
Commits 90d
102
Releases 90d
1
Default Branch
main
License
Apache-2.0
Repository Status
Active repository
Evidence

Signal Quality

Data Confidence90/100Strong
Source Coverage90/100Strong
Publish Confidence90/100Strong

ConfidenceHigh-confidence score from multiple public signals.

Zombie RiskNo meaningful zombie signal right now.

How ToolVitals scores work
Openness

License Evidence

Class
OSI-approved OSS
License
Apache-2.0

This tool has an OSI-approved open-source license signal.

Sources

Tracked Sources

Profile

Classification

Category
Communication
Use Case
Self-Hosted Email Server
Openness
OSI-approved OSS
License
Apache-2.0
Tool Mode
Source-visible project
Score Model
Open Source Maintenance
Score Visibility
Scored Intelligence
Status
Active
Maintainers

README Badge

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For agents

Machine-readable profile

Use the clean Markdown or structured JSON representation from the same published ToolVitals evidence snapshot.

ToolVitals agent access guide
Latest

Recent Updates

Tags
open-sourceemailemail-serveremail-templatemtamta-serversmtpsmtp-mailsmtp-mailersmtp-relaysmtp-serversmtpdmail-serveremail-infrastructurehigh-volume-emailself-hosted

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