MailHog vs OpenDKIM
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?
MailHog
Email testing tool with a fake SMTP server
VS
OpenDKIM
DKIM signing and verification filter for mail servers
| Feature | MailHog | OpenDKIM |
|---|---|---|
| Category | Mail Servers | Mail Servers |
| License | MIT | BSD-3-Clause |
| Language | Go | C |
| Setup difficulty | Easy | Medium |
| Min. RAM | 64 MB | 64 MB |
| Deployment | docker, binary, source | bare-metal, source |
| GitHub stars | ★ 16,107 | ★ 117 |
| First released | 2014 | 2009 |
| Replaces | Mailtrap | Proprietary email security gateways |
Why pick each one
Choose MailHog if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Mature project with 16.1k GitHub stars
Choose OpenDKIM if…
- Released under the BSD-3-Clause license
- Written in C
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is MailHog or OpenDKIM better?
MailHog is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider OpenDKIM if its specific feature set fits your needs better.
Are MailHog and OpenDKIM free and open-source?
Yes. MailHog is licensed under MIT and OpenDKIM under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run MailHog and OpenDKIM with Docker?
MailHog: yes. OpenDKIM: check the project docs for container support.