SHSelfHostIndex

DKIMpy Milter 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?
DK DKIMpy Milter DKIM signing and verification milter for mail servers VS ST Stalwart Mail Server Modern all-in-one mail server in a single binary
FeatureDKIMpy MilterStalwart Mail Server
CategoryMail ServersMail Servers
LicenseGPL-2.0AGPL-3.0
LanguagePythonRust
Setup difficultyMediumMedium
Min. RAM64 MB512 MB
Deploymentbare-metal, sourcedocker, binary, bare-metal
GitHub stars★ 20★ 14,059
First released20182020
ReplacesHosted email authenticationMicrosoft Exchange, Google Workspace

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
DKIMpy Milter details

Choose Stalwart Mail Server if…

  • Single modern binary
  • Strong security defaults
Stalwart Mail Server details

Frequently asked questions

Is DKIMpy Milter 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 DKIMpy Milter and Stalwart Mail Server free and open-source?

Yes. DKIMpy Milter is licensed under GPL-2.0 and Stalwart Mail Server under AGPL-3.0. Both can be self-hosted at no software cost.

Can I run DKIMpy Milter and Stalwart Mail Server with Docker?

DKIMpy Milter: check the project docs for container support. Stalwart Mail Server: yes.

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