Communication
Self-Hosted Email Server
Self-hosted mail server stacks for deploying and managing SMTP, IMAP, webmail, DNS, and related email infrastructure.
Best Self-Hosted Email Server tools by public signals
These picks are computed from scored public evidence. Use the openness column in the ranking to separate OSI-approved, source-available, open-core, proprietary, and unverified-license tools.
Use Case Rankings
Ordered by ToolVitals score, then health, shipping, confidence, GitHub stars, and name.
| # | Tool | Health | Shipping | Openness | Stars | Score | Status |
|---|---|---|---|---|---|---|---|
| 01 | Modoboa Mail hosting made simple | 95 | 94 | OSI-approved OSS | 3.5k | 95 | Active |
| 02 | Mailu Self-hosted mail server stack packaged as Docker images. | 95 | 93 | OSI-approved OSS | 7.6k | 94 | Active |
| 03 | gromox Groupware backend supporting mail and calendar protocols. | 94 | 93 | OSI-approved OSS | 268 | 94 | Active |
| 04 | KumoMTA The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments. | 93 | 89 | OSI-approved OSS | 563 | 91 | Active |
| 05 | Mox modern full-featured open source secure mail server for low-maintenance self-hosted email | 73 | 60 | OSI-approved OSS | 5.9k | 68 | Warning |
Not Scored
Tracked for context, but excluded from rankings because comparable open/source-visible evidence is unavailable.