Open-source alternatives to SendGrid
Looking to replace SendGrid with something free and open-source? These 3 tools are the best open alternatives in 2026 — most are self-hostable, so you keep full control of your data and pay no subscription.
At a glance: how they compare
Click a column to sort — the best one depends on what matters to you.
| Alternative | Stars | Language | License | Last commit | In one line |
|---|---|---|---|---|---|
| Postal | — | — | MIT | — | Full mail delivery platform you host yourself. |
| Listmonk | — | — | AGPL-3.0 | — | High-performance newsletter and mailing list manager. |
| Haraka | — | — | MIT | — | Fast, plugin-based SMTP server in Node.js. |
Which one should you pick?
Postal
Full mail delivery platform you host yourself. Its MIT license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Listmonk
High-performance newsletter and mailing list manager. Its AGPL-3.0 license keeps the project and its forks open-source forever, and commercial use is allowed. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Haraka
Fast, plugin-based SMTP server in Node.js. Its MIT license is permissive — free to use commercially, embed and modify. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Switching from SendGrid without the drama
- Export your data from SendGrid first — most tools above can import standard formats.
- Run your top pick in parallel for a week or two before committing; self-hosted options can be tried locally in minutes.
- Migrate one team or one project at a time, keeping the old account read-only until everything checks out.
FAQ
What is the best open-source alternative to SendGrid?
The top open-source alternative is Postal — Full mail delivery platform you host yourself. The full ranked list is above.
Are these SendGrid alternatives free?
Yes. Every tool listed is open-source and free to use; most can be self-hosted so you keep full control of your data.
Can I self-host an alternative to SendGrid?
Most of these tools are designed to run on your own server or machine, giving you privacy and no subscription fees.
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