Mailpit

No phone app

7.0No. 10 of 27
in Email Testing Software

Recognised40% of the score44
Phone app26% of the score0
Documented20% of the score100
Free plan14% of the score100

Free plan: Yes
Runs on: api, Linux, Mac, self-hosted, Web, Windows

Summary

Mailpit is ranked #10 of 27 in email testing software on Samsung Mobile US Press. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Mailpit plans and pricing

All plans

Mailpit Free Single static binary or multi-architecture Docker images · Default retention: most recent 500 emails mailpit.axllent.org · 4 Oct 2026

Compared on email testing software

Device coverage: bothmailpit.axllent.org
Spam checks: Yesmailpit.axllent.org
Link checks: Yesmailpit.axllent.org
Inbox testing: Yesmailpit.axllent.org
API access: Yesmailpit.axllent.org

Facts

Purpose: Mailpit is an open-source utility for testing emails and SMTP delivery, with a local SMTP server, web interface, and integration-testing API.mailpit.axllent.org · 4 Oct 2026
Developer features: The web UI can show formatted HTML, HTML source, text, headers, raw source, and MIME attachments, including image thumbnails.mailpit.axllent.org · 4 Oct 2026
Email checks: Mailpit offers HTML email compatibility checks, link checks, SpamAssassin-based spam checks, and HTML message screenshots.mailpit.axllent.org · 4 Oct 2026
Message handling: Messages can be tagged, relayed through another SMTP server, automatically forwarded, or used to trigger configurable SMTP errors for resilience testing.mailpit.axllent.org · 4 Oct 2026
Automation: Mailpit provides a REST API for accessing, searching, deleting, sending, tagging, and releasing messages.mailpit.axllent.org · 4 Oct 2026
Integrations: Mailpit can send message-summary webhooks to external services, has been tested with n8n, and has a Cypress package for integration tests.mailpit.axllent.org · 4 Oct 2026
Deployment: Mailpit runs as a single binary or multi-architecture Docker image, and publishes static binaries for Windows, Linux, and Mac.mailpit.axllent.org · 4 Oct 2026
Security controls: The web UI and API can use HTTPS and basic authentication, while SMTP supports optional STARTTLS or SSL/TLS and authentication.mailpit.axllent.org · 4 Oct 2026
Email rendering security: The UI applies a strict Content-Security-Policy that blocks remote content other than images, stylesheets, and fonts, and sets a no-referrer policy.mailpit.axllent.org · 4 Oct 2026
Default SMTP configuration: By default, SMTP listens on port 1025 without encryption or authentication.mailpit.axllent.org · 4 Oct 2026
Capacity and retention: Mailpit reports SMTP ingestion of 100–200 emails per second depending on system and message factors, and by default prunes messages to keep the most recent 500.mailpit.axllent.org · 4 Oct 2026
POP3 limit: The optional POP3 service makes only the latest 100 messages available for performance reasons.mailpit.axllent.org · 4 Oct 2026
Intended users: Mailpit is aimed at developers testing email functionality without sending messages to real email addresses.mailpit.axllent.org · 4 Oct 2026
Project history: Mailpit was first released on July 30, 2022.mailpit.axllent.org · 4 Oct 2026
Install format: Mailpit runs as a single binary or multi-architecture Docker image without additional dependencies.mailpit.axllent.org · 4 Oct 2026
Message inspection: The web UI can display formatted HTML, highlighted HTML source, text, headers, raw source, and MIME attachments with image thumbnails.mailpit.axllent.org · 4 Oct 2026
HTML checks: HTML Check compares messages against more than 175 HTML and CSS checks based on compatibility data from caniemail.com.mailpit.axllent.org · 4 Oct 2026
Automated testing: Mailpit offers a REST API for integration testing and a Chaos feature that can trigger configurable SMTP errors.mailpit.axllent.org · 4 Oct 2026
Other testing tools: Features include link checking, HTML message screenshots from the web UI, and optional spam scoring through SpamAssassin.mailpit.axllent.org · 4 Oct 2026
Platform support: The installation guide provides static binaries for Windows, Linux, and Mac, plus Docker images for 386, amd64, and arm64.mailpit.axllent.org · 4 Oct 2026
Security: The web UI supports optional HTTPS and basic authentication, while SMTP can be configured with authentication and TLS.mailpit.axllent.org · 4 Oct 2026
Privacy protections: The UI uses a strict Content-Security-Policy and a no-referrer policy; tracking images are still allowed.mailpit.axllent.org · 4 Oct 2026
Network safety: Link checking blocks requests to internal networks by default to help prevent server-side request forgery.mailpit.axllent.org · 4 Oct 2026
Notable limits: Mailpit keeps the most recent 500 emails by default, and its SMTP server allows up to 100 recipients per message by default.mailpit.axllent.org · 4 Oct 2026
Support: The troubleshooting guide invites users to raise an issue after checking existing issues first.mailpit.axllent.org · 4 Oct 2026
Intended audience: Mailpit is described as a development SMTP and email testing tool for developers, including use in CI/CD pipelines.mailpit.axllent.org · 4 Oct 2026