MailCatcher
MailCatcher: A focused open-source email catcher for inspecting application messages locally. Ranked #26 of 27 in Email Testing Software by our editors (5.9/10); pricing: Open source; best for minimal self-hosted application-email capture.
At a glance
- Editor score5.9 / 10
- PricingOpen source
- Best forMinimal self-hosted application-email capture
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Captures application email through a local SMTP server
- Shows HTML, plain-text, source, attachments, and message parts
- Provides configurable endpoints and a REST-like JSON API
Where it doesn't
- Does not provide email-client rendering tests
- Does not include spam or accessibility testing
- Does not target live inbox-placement testing
Our verdict on MailCatcher
MailCatcher is an open-source development tool for capturing application email locally. It runs an SMTP server, stores messages for inspection, and presents them through a web interface. Developers can switch between HTML, plain-text, and source views, inspect inline images and attachments, download original messages, and retrieve message data through its REST-like API. Its fit is strongest for teams that need a lightweight, self-hosted way to verify what an application sends during development, especially in Rails, PHP, and Django workflows.
The product keeps its scope focused on message capture and inspection. Configurable SMTP and HTTP addresses and ports support different local environments, while foreground or background operation gives developers a choice between an interactive process and a daemon. A PHP-compatible catchmail command supports PHP workflows, and the API includes JSON and message-part endpoints for automated access. MailCatcher can also run in Docker, making it suitable for development setups that already use containerized services.
MailCatcher should be chosen when the priority is seeing application-generated email without sending it to real recipients. It is less suitable when a team needs verified rendering across email clients, spam testing, accessibility checks, link testing, or inbox-placement analysis. The web interface and message-part downloads cover practical inspection needs, while the API supports development tooling and automated workflows. Its narrow purpose is an advantage for local email capture, but teams seeking broader email quality assurance should consider a product built around those additional testing areas.
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MailCatcher pricing
MailCatcher fact sheet
| Free plan | Not verified |
|---|---|
| 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 |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Rails, PHP, Django |
| Pricing | Open source |
| Website | mailcatcher.me |
| Facts checked | 20 Sep 2026 |
MailCatcher integrations
MailCatcher lists 3 integrations on its own site.
- Rails
- PHP
- Django
Alternatives to MailCatcher
- 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 MailCatcher alternatives →
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Featured on iTechGuides
MailCatcher is listed in our Email Testing Software directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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