Mail-in-a-BoxvsUnderstudy
Two self-hosted projects, compared on the numbers selfhost.directory tracks live: score, popularity, release cadence and setup effort.
| Mail-in-a-Box | Understudy | |
|---|---|---|
| Score | 72/100 | 48/100 |
| Rank in category | #3 of 16 in Mail Server | #110 of 209 in AI Agents |
| GitHub stars | 15 446 | 465 |
| Stars, last 30 days | +27 | +0 |
| Stable releases, 12 months | 4 | 0 |
| Latest release | v77 · 26 Sept 2026 | — |
| Setup | Moderate | Moderate |
| Official Docker image | No | No |
| License | CC0-1.0 | MIT |
| Main language | Python | Typescript |
Which one should you pick?
Mail-in-a-Box scores 72/100 against 48/100 for Understudy, so it is the safer default.
Mail-in-a-Box ships more often: 4 stable releases in the past year, against 0 for Understudy.
Mail-in-a-Box is growing faster right now (+27 stars in 30 days).
Mail-in-a-Box details →Understudy details →
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