pppscn / 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
knadh / listmonk
Self-hosted newsletter and mailing list manager distributed as a single binary, backed by PostgreSQL.
curl / curl
A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
dreamhunter2333 / cloudflare_temp_email
CloudFlare free temp domain email 免费收发 临时域名邮箱 支持附件 IMAP SMTP TelegramBot
flectar / mail
Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.
UCS-Care-Group / mailcraft
MailCraft: an open-source, clean-room mail, calendar and contacts program in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.
pimalaya / himalaya
CLI to manage emails
docker-mailserver / docker-mailserver
Containerized full-stack mail server bundling Postfix, Dovecot, Rspamd, and ClamAV for SMTP, IMAP, and POP3 with config-file-based setup.
PHPMailer / PHPMailer
The classic email sending library for PHP
Mailu / Mailu
Insular email distribution - mail server as Docker images
maildev / maildev
:mailbox: SMTP Server + Web Interface for viewing and testing emails during development.
kurrier-org / kurrier
Kurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.
hkdb / aerion
An Open Source Lightweight E-Mail Client
stalwartlabs / stalwart
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
MailCore / mailcore2
MailCore 2 provide a simple and asynchronous API to work with e-mail protocols IMAP, POP and SMTP. The API has been redesigned from ground up.
forwardemail / forwardemail.net
Privacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.
goposta / posta
Self-hosted email delivery platform that enables applications to send emails via HTTP APIs while handling SMTP delivery, templates, storage, security, and analytics. Fully self-hostable alternative to services like SendGrid or Mailgun.
dahlia / upyo
Upyo is a simple and cross-runtime library for sending email messages using SMTP and various email providers. It works on Node.js, Deno, Bun, and edge functions.
MillionSend / millionsend
The open-source email platform — self-host on your own AWS SES, or use the cloud. Resend-compatible API.
GagnDeep / mailysend
A Resend-compatible email platform on Cloudflare Workers — transactional sending, broadcasts, automations, inbound mail and deliverability analytics. MIT, one-click deployable into your own account.
postalserver / postal
📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail
mail-in-a-box / mailinabox
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.
axllent / mailpit
An email and SMTP testing tool with API for developers
jstedfast / MailKit
A cross-platform .NET library for IMAP, POP3, and SMTP.
foxcpp / maddy
✉️ Composable all-in-one mail server.
twisted / twisted
Event-driven networking engine written in Python.
haraka / Haraka
A fast, highly extensible, and event driven SMTP server
projectdiscovery / interactsh
An OOB interaction gathering server and client library
rnwood / smtp4dev
smtp4dev - the fake smtp email server for development and testing
neomutt / neomutt
✉️ Teaching an Old Dog New Tricks -- IRC: #neomutt on irc.libera.chat
ChangemakerStudios / Papercut-SMTP
Papercut SMTP -- The Simple Desktop Email Server
acl-dev / acl
C/C++ server and network library, including coroutine,redis client,http/https/websocket,mqtt, mysql/postgresql/sqlite client with C/C++ for Linux, Android, iOS, MacOS, Windows, Harmony,etc..
TermuxHackz / X-osint
This is an Open source intelligent framework ie an osint tool which gathers valid information about a phone number, user's email address, perform VIN Osint, and reverse, perform subdomain enumeration, able to find email from a name, and so much more. Best osint tool for Termux and linux
inbucket / inbucket
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.
Anil-matcha / open-agent-email
Open-source email infrastructure for AI agents: secure inboxes, REST and MCP APIs, SMTP, human approval workflows, signed webhooks, and Python and TypeScript SDKs. Self-host with Docker and PostgreSQL.
cypht-org / cypht
Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)
AfterShip / email-verifier
:white_check_mark: A Go library for email verification without sending any emails.
deltachat / deltachat-desktop
Decentralized private messenger with chat-shared tools and games for Desktop
wneessen / go-mail
📧 Easy to use, yet comprehensive library for sending mails with Go
simonrob / email-oauth2-proxy
An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method. Keep legacy email clients working with Exchange Online, Gmail and other providers.
domainaware / parsedmarc
A Python package and CLI for parsing aggregate and forensic DMARC reports
bbottema / simple-java-mail
Simple API, Complex Emails (Jakarta Mail smtp wrapper)
truemail-rb / truemail
🚀 Configurable framework agnostic plain Ruby 📨 email validator/verifier. Verify email via Regex, DNS, SMTP and even more. Be sure that email address valid and exists.
dovecot / core
Dovecot mail server
postfixadmin / postfixadmin
PostfixAdmin - web based virtual user administration interface for Postfix mail servers
Mindbaz / awesome-opensource-email
Awesome Opensource Email Resources
Badgerati / Pode
Pode is a Cross-Platform PowerShell web framework for creating REST APIs, Web Sites, and TCP/SMTP servers
apache / james-project
Emails at the heart of your business logic!
nextcloud / mail
💌 Mail app for Nextcloud
goshs-labs / goshs
Feature-rich single-binary file server for red teamers and developers. HTTP/S · WebDAV · FTP/SFTP · SMB · LDAP/S · NTLM hash capture · DNS/SMTP callbacks · TLS · Auth · Share links. A powerful python3 -m http.server replacement.
chatmail / core
Chatmail Rust Core library, used by Android/iOS/desktop chatmail apps, bindings and bots 📧
hyvor / relay
📨 Open-Source Email API for Developers. Cloud & Self-hosted Alternative to SES, Mailgun, SendGrid.
nodemailer / smtp-server
Create custom SMTP servers on the fly
bokysan / docker-postfix
Multi architecture simple SMTP server (postfix null relay) host for your Docker and Kubernetes containers. Based on Debian/Ubuntu/Alpine.
mguessan / davmail
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
greenmail-mail-test / greenmail
Official master for the Greenmail project
gen-smtp / gen_smtp
The extensible Erlang SMTP client and server library.
shenxn / protonmail-bridge-docker
ProtonMail IMAP/SMTP Bridge Docker container
xhit / go-simple-mail
Golang package for send email. Support keep alive connection, TLS and SSL. Easy for bulk SMTP.
decke / smtprelay
Simple Golang SMTP relay/proxy server