OpenSMTPD
Secure SMTP server implementation from the OpenBSD project.
Description from awesome-selfhosted (CC BY-SA 3.0)
Still maintained? Yes: 57 commits in the last 90 days, latest release 7.9.0p0 (Sep 2026).
Comparisons in Communication - Email - Mail Transfer Agents: SendGrid alternatives.
At a glance
OpenSMTPD quick facts
- Health score
- 81/100 GOOD
- Stars
- 586
- Last commit
- 2 months ago (Sep 2026)
- Latest release
- 7.9.0p0, Sep 2026
- Licence
- ISC
Top alternatives to OpenSMTPD
In its own words
The project's README opens: "OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions."
Why it ranks here
Health score explained
OpenSMTPD scores 81/100, #1 of 9 in Communication - Email - Mail Transfer Agents: 57 commits in the last 90 days earn 35.0 of 35 points, the latest release (7.9.0p0, 2 months ago) earns 25.0 of 25, 586 stars add 11.1 of 20, an active, unarchived repository keeps 10 and no advertised Docker image leaves the final 10 unclaimed. That places it in the good band (70 and above). The biggest shortfall is Docker support, worth 10.0 more points.
Recomputed nightly from the GitHub API. How the score is calculated.
- Commit activity 35.0 / 35
57 commits in 90 days (30+ scores full marks)
- Release recency 25.0 / 25
7.9.0p0 released 2 months ago
- Stars 11.1 / 20
586 stars on GitHub (logarithmic)
- Not archived 10.0 / 10
Repository is active
- Docker support biggest shortfall 0.0 / 10
No Docker support advertised
Commit activity
- 57
- Last 90 days
- 61
- Last 12 months
- 2 months ago
- Last push
Ranked #1 of 9 tools in Communication - Email - Mail Transfer Agents by health , just above Haraka (#2) .
Details
| Licence | ISC |
| Platforms | C, deb |
| Latest release | 7.9.0p0 · 2 months ago |
| Stars | 586 |
| Open issues | 114 |
| Docker | Not advertised |
| Repository | OpenSMTPD/OpenSMTPD ↗ |
OpenSMTPD vs its top 2 alternatives
Active tools that share a category with OpenSMTPD (Communication - Email - Mail Transfer Agents), scored on the same five terms.
OpenSMTPD: common questions
Is OpenSMTPD still maintained?
OpenSMTPD had 57 commits in the last 90 days and its last push was 2 months ago; the latest tagged release, 7.9.0p0, is from 2 months ago. Repoly recomputes this nightly.