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Best Open Source smtp Libraries

A curated list of the most popular GitHub repositories tagged with smtp. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1pppscn/SmsForwarder

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

24,603Kotlin
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#2PHPMailer/PHPMailer

The classic email sending library for PHP

22,028PHP
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#3knadh/listmonk

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

19,095Go
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#4docker-mailserver/docker-mailserver

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

17,925Shell
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#5Billionmail/BillionMail

BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr

13,543Go
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#6mailcow/mailcow-dockerized

mailcow: dockerized - 🐮 + 🐋 = 💕

12,191JavaScript
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#7jstedfast/MailKit

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

6,729C#
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#8sj26/mailcatcher

Catches mail and serves it through a dream.

6,727Ruby
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