smtp4dev is a suite of tools featuring a mock SMTP server that intercepts outgoing email traffic and stores messages for inspection instead of delivering them to recipients. It includes a web-based viewer for inspecting email metadata, raw source code, and MIME structures, alongside a responsive email previewer that simulates how HTML emails appear across different viewport sizes and device layouts.
The project provides a traffic analyzer to log protocol interactions and session data for debugging delivery failures. It also operates as a TLS SMTP server, supporting encrypted connections via TLS and SSL to mimic secure production environments.
The system covers broader capabilities for local SMTP testing, email template development, and automated email integration. It offers both a web-based viewer and a terminal user interface for managing and monitoring intercepted mail traffic in headless environments.
