Courier MTA vs Sendmail
A side-by-side comparison of Courier MTA and Sendmail — pricing, license, deployment, and where each tool wins.
Courier MTA
courier-mta.org
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
Sendmail
proofpoint.com
Message transfer agent (MTA).
| Feature | Courier MTA | Sendmail |
|---|---|---|
| Pricing | Free | Free |
| Model | Open-source | Open-source |
| License | CC-BY-SA-3.0 | CC-BY-SA-3.0 |
| Deployment | Self-hosted | Self-hosted |
| Category | Communication - Email - Mail Transfer Agents | Communication - Email - Mail Transfer Agents |
| Self-hosted | ✓Yes | ✓Yes |
| Free tier | ✓Yes | ✓Yes |
Pick Courier MTA if…
- ✓You prefer Courier MTA's feature set or ecosystem fit.
Pick Sendmail if…
- ✓You prefer Sendmail's feature set or ecosystem fit.
Switch from Courier MTA → Sendmail
4–16hmedium risk
Plan a sprint — 4-16 engineering hours, run in parallel for a week.
Export from Courier MTA: CSV, JSON
1 things to watch
- ⚠Manual data review recommended
Switch from Sendmail → Courier MTA
4–20hmedium risk
Plan a sprint — 4-20 engineering hours, run in parallel for a week.
Export from Sendmail: CSV, JSON
2 things to watch
- ⚠Manual data review recommended
- ⚠Fewer tutorials online for Courier MTA — expect more trial-and-error