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, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features

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

Insular email distribution - mail server as Docker images

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

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

Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.

Fake Protocol Server

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method.

Dovecot mail server

A Python Package for Data Exfiltration

Official master for the Greenmail project

DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at

mailio is a cross platform C++ library for MIME format and SMTP, POP3, IMAP protocols. It is based on the standard C++ 17 and Boost library.

VMime Mail Library

Mailozaurr is a PowerShell module that aims to provide SMTP, POP3, IMAP and probably some other ways to interact with Email. Underneath it uses MimeKit and MailKit libraries written by Jeffrey Stedfast.

Eventum Issue Tracking System

Fullstack, security focused, personal mail server based on OpenSMTPD for OpenBSD

🐳 🔧 Provides Autodiscover capabilities for IMAP/POP/SMTP/LDAP services on Microsoft Outlook/Apple Mail and Autoconfig capabilities for Thunderbird

small mail server