aerc vs Stalwart Mail Server
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?
aerc
Efficient terminal-based email client
VS
Stalwart Mail Server
Modern all-in-one mail server in a single binary
| Feature | aerc | Stalwart Mail Server |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | MIT | AGPL-3.0 |
| Language | Go | Rust |
| Setup difficulty | Medium | Medium |
| Min. RAM | 64 MB | 512 MB |
| Deployment | binary, source | docker, binary, bare-metal |
| GitHub stars | ★ 3,300 | ★ 14,059 |
| First released | 2019 | 2020 |
| Replaces | Gmail, Outlook | Microsoft Exchange, Google Workspace |
Why pick each one
Choose aerc if…
- Released under the MIT license
- Active community (3.3k GitHub stars)
- Written in Go
- Tiny footprint — runs in 64 MB RAM
Choose Stalwart Mail Server if…
- Single modern binary
- Strong security defaults
Frequently asked questions
Is aerc or Stalwart Mail Server better?
Neither is universally better. Stalwart Mail Server has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are aerc and Stalwart Mail Server free and open-source?
Yes. aerc is licensed under MIT and Stalwart Mail Server under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run aerc and Stalwart Mail Server with Docker?
aerc: check the project docs for container support. Stalwart Mail Server: yes.