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Structured facts from the catalog for the leading projects in this category.
| Attribute | listmonk | Postal | Mailcow | phpList | Senlo | LetterSpace |
|---|---|---|---|---|---|---|
| GitHub stars | 23,642 | 16,849 | 13,556 | 874 | 177 | 100 |
| License | AGPL-3.0 | MIT | GPL-3.0 | AGPL-3.0 | AGPL-3.0 | MIT |
| Self-hosted | Yes | Yes | Yes | Yes | Yes | Yes |
| Docker noted | — | — | — | Yes | Yes | — |
| Cloud / hosted | — | — | — | — | — | — |
| Primary language | Go | Ruby | JavaScript | PHP | TypeScript | TypeScript |
| Last commit | 2026-09-30 | 2026-10-01 | 2026-09-21 | 2026-09-18 | 2026-10-03 | 2026-10-02 |
| Difficulty | Easy | Not assessed | Not assessed | Not assessed | Not assessed | Not assessed |
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Not a sponsored ranking. Repository activity is a signal, not a quality guarantee.