smtp

stalwart

+220

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

flectar/mail

+137

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.

mailcraft

+49

MailCraft: an open-source, clean-room mail, calendar and contacts program in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.

knadh/listmonk

+94

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

SmsForwarder

+87

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

mailcow-dockerized

+50

mailcow: dockerized - 🐮 + 🐋 = 💕

docker-mailserver

+47

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

himalaya

+35

CLI to manage emails

millionsend

+21

The open-source email platform — self-host on your own AWS SES, or use the cloud. Resend-compatible API.