pop3 topic

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

inbucket

Dovecot mail server

dovecot

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

Excision-Mail

VMime Mail Library

kisli

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

jstedfast

Cypht: Lightweight Open Source webmail written in PHP and JavaScript

cypht-org

Official master for the Greenmail project

greenmail-mail-test

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

karastojko

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

simonrob

.NET email library and proxy supporting IMAP, POP3, and SMTP with S/MIME and PGP.

bertjohnson