MailHog
MailHog: A flexible local mail catcher for development teams that need message inspection and release. Ranked #19 of 27 in Email Testing Software by our editors (6.6/10); pricing: Free plan; best for self-hosted teams needing flexible mail storage.
At a glance
- Editor score6.6 / 10
- PricingFree plan
- Best forSelf-hosted teams needing flexible mail storage
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Captures local SMTP messages for web-based inspection
- HTTP JSON API supports message retrieval, deletion, and downloads
- Supports in-memory, MongoDB, and maildir storage backends
Where it doesn't
- Does not provide verified email rendering checks
- No spam or accessibility testing features
- Not intended for production email delivery
Our verdict on MailHog
MailHog is an open-source email testing tool for developers working in development and test environments. Applications send messages to its local SMTP server, while teams inspect plain-text, HTML, and source content through a web interface. The HTTP JSON API adds programmatic access for listing, retrieving, deleting, and downloading messages. MailHog is available for web, macOS, Linux, API, and self-hosted use, with Docker and package-manager options alongside platform binaries.
Its strongest fit is flexible message handling. MailHog can release selected messages to real SMTP servers, supports multipart MIME and MIME-part downloads, and provides real-time updates through EventSource. SMTP AUTH and PIPELINING support help it fit into applications that require those SMTP behaviors. Storage can remain in memory or use MongoDB or maildir, while HTTP Basic Authentication is available for the web interface and API. SMTP, MongoDB, and Docker integrations support common self-hosted development setups.
MailHog is narrower than email testing platforms built around inbox previews and quality checks. It does not provide verified rendering, spam, accessibility, or link checks, so teams evaluating how messages appear across email clients or checking content quality will need a different tool or additional testing systems. Its Chaos Monkey feature supports failure testing, but the product remains centered on local SMTP capture, inspection, storage, and controlled release rather than production delivery. Choose MailHog when open-source deployment, API access, and storage control matter most; choose another product when rendering, spam, accessibility, or link validation is central.
Your product? Our editors can test MailHog in depth and publish a review, labelled as paid · from $149/mo →
MailHog pricing
MailHog fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Email clients | Not verified |
| Device coverage | Not verified |
| Spam checks | Not verified |
| Accessibility checks | Not verified |
| Link checks | Not verified |
| Inbox testing | Not verified |
| API access | Yes |
| Deployment | Self-hosted |
| Platforms | Web, macOS, Linux |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: SMTP, MongoDB, Docker |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
MailHog integrations
MailHog lists 3 integrations on its own site.
- SMTP
- MongoDB
- Docker
Alternatives to MailHog
- LitmusBroad pre-send email QA with previews, testing, monitoring, integrations, and APIs.9.3
- Twilio Email TestingA flexible email-testing option with a free trial, rendering checks, spam tests, and API access.8.8
- GlockAppsA broad deliverability toolkit for inbox placement, reputation, authentication, and alerts.8.5
See all MailHog alternatives →
Used MailHog? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used MailHog for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
MailHog is listed in our Email Testing Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/mailhog/"><img src="https://www.itechguides.com/best/badge/mailhog.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update