Cuttlefish vs Mailspring
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
Cuttlefish
Transactional email server with click and open tracking
VS
Mailspring
Cross-platform desktop email client
| Feature | Cuttlefish | Mailspring |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | AGPL-3.0 | GPL-3.0 |
| Language | Ruby | JavaScript |
| Setup difficulty | Medium | Easy |
| Min. RAM | 1,024 MB | 512 MB |
| Deployment | docker, bare-metal, source | binary, source |
| GitHub stars | ★ 1,624 | ★ 17,730 |
| First released | 2014 | 2017 |
| Replaces | Mailgun, SendGrid, Postmark | Outlook, Apple Mail |
Why pick each one
Choose Cuttlefish if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Active community (1.6k GitHub stars)
- Written in Ruby
Choose Mailspring if…
- Released under the GPL-3.0 license
- Easy to set up — beginner-friendly
- Mature project with 17.7k GitHub stars
- Written in JavaScript
Frequently asked questions
Is Cuttlefish or Mailspring better?
Mailspring is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Cuttlefish if its specific feature set fits your needs better.
Are Cuttlefish and Mailspring free and open-source?
Yes. Cuttlefish is licensed under AGPL-3.0 and Mailspring under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Cuttlefish and Mailspring with Docker?
Cuttlefish: yes. Mailspring: check the project docs for container support.