Software · Internet & communication

Mailpit

An email and SMTP testing tool with API for developers.

Completely free
Windows
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Winget (Windows Package Manager)
License: MIT — Open source (permissive)confirmed by Winget (Windows Package Manager)
Open source: Yes
Commercial use: Yesconfirmed by Winget (Windows Package Manager)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Winget (Windows Package Manager)
Watermark: Not applicable
Ads: not documented
Platforms: WindowsEstablished by Windows: Winget
Publisher: Ralph Slooten
Latest version: 1.33.0
Source code: github.com/axllent/mailpit

Overview

Features described in its GitHub repository and in its Winget manifest: web interface.

Services and protocols mentioned: SMTP.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“It acts as an SMTP server, provides a modern web interface to view & test captured emails, and includes an API for automated integration testing.” — GitHub, 10 November 2026

At a glance

All of Mailpit is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

Open source code
No account needed
Commercial use allowed

Sources and checks

Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from github.com — Manifeste Winget (MIT)

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