# Stalwart Mail Server vs Ultimate Certificate Manager

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

| | Stalwart Mail Server | Ultimate Certificate Manager |
|---|---|---|
| Score | 78/100 ✓ | 50/100 |
| Rank in category | #2 of 16 in Mail Server | #4 of 8 in Certificate Management |
| GitHub stars | 15 464 ✓ | 170 |
| Stars, last 30 days | +680 | — |
| Stable releases, 12 months | 31 ✓ | 4 |
| Latest release | v1.0.1 · 28 Oct 2026 ✓ | v2.246 · 27 Oct 2026 |
| Setup | Moderate | Moderate ✓ |
| Official Docker image | Yes | Yes |
| License | AGPL-3.0-only AND LicenseRef-SEL | AGPL-3.0 |
| Main language | Rust | Python |

## Which one should you pick?

Stalwart Mail Server scores 78/100 against 50/100 for Ultimate Certificate Manager, so it is the safer default.

Stalwart Mail Server ships more often: 31 stable releases in the past year, against 4 for Ultimate Certificate Manager.

Stalwart Mail Server is growing faster right now (+680 stars in 30 days).

## Details

- [Stalwart Mail Server](https://selfhost.directory/project/stalwart-mail-server) (markdown: https://selfhost.directory/project/stalwart-mail-server.md)
- [Ultimate Certificate Manager](https://selfhost.directory/project/ultimate-ca-manager) (markdown: https://selfhost.directory/project/ultimate-ca-manager.md)

---
Source: https://selfhost.directory/compare/stalwart-mail-server-vs-ultimate-ca-manager