The classic email sending library for PHP
ObjectivePGP is an open-source library for iOS and macOS
Lightweight Open Source webmail written in PHP and JavaScript
Bubbles the simple, easy to use HTTP web server, browser controlled
Outlook Plugin for storing emails to Alfresco
java example
Tools to convert Z mark-up to HTML or text.
a lightweight ANSI C library for handling POP3 mailboxes
C++ MIME decode library
Robust open source POP3 client and MIME parser written in C#
A free .NET library for accessing IMAP servers, written in C#