DKIMpy Milter vs Postal
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?
DKIMpy Milter
DKIM signing and verification milter for mail servers
VS
Postal
Complete mail delivery platform for outgoing email
| Feature | DKIMpy Milter | Postal |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | GPL-2.0 | MIT |
| Language | Python | Ruby |
| Setup difficulty | Medium | Hard |
| Min. RAM | 64 MB | 2,048 MB |
| Deployment | bare-metal, source | docker, bare-metal |
| GitHub stars | ★ 20 | ★ 16,724 |
| First released | 2018 | 2017 |
| Replaces | Hosted email authentication | SendGrid, Mailgun, Postmark |
Why pick each one
Choose DKIMpy Milter if…
- Released under the GPL-2.0 license
- Written in Python
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is DKIMpy Milter or Postal better?
Neither is universally better. Postal has the larger community, while DKIMpy Milter is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are DKIMpy Milter and Postal free and open-source?
Yes. DKIMpy Milter is licensed under GPL-2.0 and Postal under MIT. Both can be self-hosted at no software cost.
Can I run DKIMpy Milter and Postal with Docker?
DKIMpy Milter: check the project docs for container support. Postal: yes.