Stalwart Mail ServervsUnderstudy
Two self-hosted projects, compared on the numbers selfhost.directory tracks live: score, popularity, release cadence and setup effort.
| Stalwart Mail Server | Understudy | |
|---|---|---|
| Score | 78/100 | 48/100 |
| Rank in category | #2 of 16 in Mail Server | #110 of 209 in AI Agents |
| GitHub stars | 15 465 | 465 |
| Stars, last 30 days | +681 | — |
| Stable releases, 12 months | 31 | 0 |
| Latest release | v1.0.1 · 28 Oct 2026 | — |
| Setup | Moderate | Moderate |
| Official Docker image | Yes | No |
| License | AGPL-3.0-only AND LicenseRef-SEL | MIT |
| Main language | Rust | Typescript |
Which one should you pick?
Stalwart Mail Server scores 78/100 against 48/100 for Understudy, so it is the safer default.
Stalwart Mail Server ships more often: 31 stable releases in the past year, against 0 for Understudy.
Stalwart Mail Server is growing faster right now (+681 stars in 30 days).
Stalwart Mail Server details →Understudy details →
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