# Mail-in-a-Box vs windmill

> Two self-hosted projects, compared on the numbers selfhost.directory tracks live: score, popularity, release cadence and setup effort.

| | Mail-in-a-Box | windmill |
|---|---|---|
| Score | 72/100 | 77/100 ✓ |
| Rank in category | #3 of 16 in Mail Server | #6 of 32 in Workflow Automation |
| GitHub stars | 15 447 | 18 308 ✓ |
| Stars, last 30 days | +29 | +288 ✓ |
| Stable releases, 12 months | 4 | 163 ✓ |
| Latest release | v77 · 26 Sept 2026 | v1.853.0 · 28 Oct 2026 ✓ |
| Setup | Moderate | Moderate |
| Official Docker image | No | Yes ✓ |
| License | CC0-1.0 | Other |
| Main language | Python | Rust |

## Which one should you pick?

windmill scores 77/100 against 72/100 for Mail-in-a-Box, so it is the safer default.

windmill ships more often: 163 stable releases in the past year, against 4 for Mail-in-a-Box.

windmill is growing faster right now (+288 stars in 30 days).

## Details

- [Mail-in-a-Box](https://selfhost.directory/project/mail-in-a-box) (markdown: https://selfhost.directory/project/mail-in-a-box.md)
- [windmill](https://selfhost.directory/project/windmill) (markdown: https://selfhost.directory/project/windmill.md)

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Source: https://selfhost.directory/compare/mail-in-a-box-vs-windmill