smtp4dev desktop Robert N Wood

linux macosx smtp-server smtp4dev windows

Use this command to install smtp4dev desktop:

winget install --id=Rnwood.Smtp4dev.Desktop -e

smtp4dev - the fake smtp email server for development and testing

SMTP4dev Desktop is a fake SMTP email server designed to assist developers and testers in simulating email sending and receiving without actually delivering emails to real recipients. This tool allows users to test email functionality in applications during development and debugging, ensuring that emails are sent correctly without spamming customers.

Key Features:

IMAP Access: Retrieve and manage messages directly from the server.
SMTP Session Logging: Detailed logging of SMTP interactions for troubleshooting.
Advanced Email Filtering: Use rules to control message routing and storage in multiple mailboxes.
HTML Compatibility Analysis: Generate reports on email client compatibility for better cross-platform support.
Responsive Design Testing: Simulate different viewport sizes to test emails on various devices.
TLS/SSL Support: Secure communication with automatic self-signed certificate generation.

Audience & Benefit:

Ideal for developers and testers working on email functionality in web and desktop applications. SMTP4dev Desktop provides a controlled environment to validate email delivery, formatting, and compatibility across different platforms without risking real-world emails. It ensures that applications send emails correctly, handle errors gracefully, and maintain user trust by avoiding unintended spam.

SMTP4dev Desktop can be installed via winget on supported systems.

smtp4dev - the fake SMTP email server for development and testing.

A dummy SMTP server for Windows, Linux, Mac OS-X (and maybe elsewhere where .NET Core is available). Lets you test your application without spamming your real customers.

smtp4dev support many advanced features:

OpenAPI/Swagger API
IMAP and POP3 access to retrieve and delete messages
SMTP session logging
Terminal User Interface (TUI) mode with full functionality
UTF8 support
Viewport size switcher to simulate mobile etc
Multipart MIME inspector
HTML compatibility report and HTML validation
TLS/SSL with implicit and STARTTLS modes and auto self-signed cert generation
Authentication
Multiple mailboxes along with rules to control what message goes where
Reply, compose and relay messages including rules to auto relay
Scripting expressions including error simulation

If you're looking for the older v2 Windows only GUI version. Grab it here.

How smtp4dev Compares

There are several fake SMTP servers available for development and testing. Here's how smtp4dev stacks up against other popular options:

Feature	smtp4dev	MailHog¹	MailCatcher²	MailDev³	FakeSMTP⁴
Web Interface	✅ Advanced	✅ Basic	✅ Basic	✅ Basic	❌ Desktop GUI
Terminal UI (TUI)	✅ Full-featured	❌	❌	❌	❌
SMTP Server	✅	✅	✅	✅	✅
IMAP Server	✅	❌	❌	❌	❌
API (REST/OpenAPI)	✅ Swagger docs	✅ Basic⁵