Discover the Best Open-Source Smtp Projects Sorted by Stars

The classic email sending library for PHP

✉️ A fully featured open source mail delivery platform for incoming & outgoing e-mail

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

短信转发器——监控Android手机短信、来电、APP通知，并根据指定规则转发到其他手机：钉钉群自定义机器人、钉钉企业内机器人、企业微信群机器人、飞书机器人、企业微信应用消息、邮箱、bark、webhook、Telegram机器人、Server酱、PushPlus、手机短信等。包括主动控制服务端与客户端，让你轻松远程发短信、查短信、查通话、查话簿、查电量等。（V3.0 新增）PS.这个APK主要是学习与自用，如有BUG请提ISSUE，同时欢迎大家提PR指正

A free & open modern, fast email client with user-friendly encryption and privacy features

mailcow: dockerized - 🐮 + 🐋 = 💕

Catches mail and serves it through a dream.

A cross-platform .NET library for IMAP, POP3, and SMTP.

Event-driven networking engine written in Python.

Insular email distribution - mail server as Docker images

A fast, highly extensible, and event driven SMTP server

:mailbox: SMTP Server + Web Interface for viewing and testing emails during development.

✉️ Composable all-in-one mail server.

Simple, modern & fast web-based email client

Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.

An email and SMTP testing tool with API for developers

✉️ Teaching an Old Dog New Tricks -- IRC: #neomutt on irc.libera.chat

All in one email sender for .NET. Supports popular senders (SendGrid, MailGun, etc) and Razor templates.