Self-Hosted Email Server

Alternatives to KumoMTA

Compare healthier or more active tools in the same use case using ToolVitals public evidence.

View KumoMTA profile View Self-Hosted Email Server leaderboard

Why compare

Signals behind this alternatives page

Commit continuity, contributor activity, and delivery signals are strong.
Health score: 91/100.
Shipping score: 86/100.

Switching guide

Best alternatives by need

Best overallgromox

Highest organic ToolVitals fit for this use case.

Healthier optionsgromox, Mox, Modoboa

Stronger current public-health signal than KumoMTA.

Verified open/source-visiblegromox, Mox, Modoboa, Mailu

Useful when portability and inspectability matter.

Trust note: Sponsors and affiliate links are separate from rankings. ToolVitals does not let monetization change scores, risk labels, organic ordering, or evidence display.

Ranked alternatives

Best-fit self-hosted email server options

4 tools

gromox

Groupware backend supporting mail and calendar protocols.

Active

Health96

Shipping96

Score96

Confidence90

Stars253

ModeSource-visible project

View profile Compare with KumoMTA

Mox

modern full-featured open source secure mail server for low-maintenance self-hosted email

Active

Health92

Shipping90

Score91

Confidence90

Stars5.9k

ModeSource-visible project

View profile Compare with KumoMTA

Modoboa

Mail hosting made simple

Active

Health95

Shipping93

Score94

Confidence90

Stars3.5k

ModeSource-visible project

View profile Compare with KumoMTA

Mailu

Self-hosted mail server stack packaged as Docker images.

Active

Health83

Shipping80

Score82

Confidence90

Stars7.5k

ModeSource-visible project

View profile Compare with KumoMTA