Haraka vs MailWhale
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Haraka | MailWhale |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 90 · Excellent | 9 · At risk |
| Status | Actively maintained | Archived |
| Category | Mail Servers | Mail Servers |
| License | MIT | MIT |
| Language | JavaScript | Go |
| Setup difficulty | Medium | Easy |
| Min. RAM | 256 MB | 64 MB |
| Deployment | docker, bare-metal, source | docker, binary, source |
| GitHub stars | ★ 5,617 | ★ 372 |
| First released | 2011 | 2021 |
| Replaces | SendGrid, Mailgun | SendGrid, Postmark |
What are Haraka and MailWhale?
Haraka
Haraka is a fast, highly extensible SMTP server written in Node.js. Its event-driven plugin architecture makes it well suited for custom mail handling and high-volume delivery.
- Event-driven plugin system
- Very high throughput
- Inbound and outbound handling
- JavaScript plugin development
MailWhale
MailWhale is a self-hosted SMTP relay that gives applications a simple way to send transactional email, with an HTTP API, multiple sender identities, and per-application access control.
- Self-hosted transactional email relay
- HTTP API for sending mail
- Per-application access control
Haraka vs MailWhale: key differences
The biggest difference is maintenance: MailWhale's repository is archived and no longer developed, while Haraka is actively maintained. Haraka is written in JavaScript, while MailWhale is built with Go. MailWhale is the lighter option, starting around 64 MB of RAM against 256 MB for Haraka. Haraka is the more established project (first released 2011), while MailWhale arrived in 2021. Haraka has the considerably larger community, at 5,617 GitHub stars versus 372.
Why pick each one
Choose Haraka if…
- Highly customizable
- Excellent performance
Watch out for
- SMTP only, no mailbox access
- Requires coding for advanced features
Choose MailWhale if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Written in Go
Frequently asked questions
Is Haraka or MailWhale better?
Neither is universally better. Haraka has the larger community, while MailWhale is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Haraka and MailWhale free and open-source?
Yes. Haraka is licensed under MIT and MailWhale under MIT. Both can be self-hosted at no software cost.
Can I run Haraka and MailWhale with Docker?
Haraka: yes. MailWhale: yes.
Which is lighter on resources, Haraka or MailWhale?
MailWhale has the smaller minimum footprint at 64 MB of RAM, compared to about 256 MB for Haraka. Real-world usage depends on library size, user count, and enabled features.