hMailServer
hMailServer是一个免费的，开源的，用于Microsoft Windows的电子邮件服务器。它被世界各地的互联网服务提供商，公司，政府，学校和爱好者使用。
它支持常见的电子邮件协议（IMAP、SMTP 和 POP3），并且可以轻松地与许多现有的 Web 邮件系统集成。它具有灵活的基于分数的垃圾邮件防护，可以附加到您的病毒扫描程序以扫描所有传入和传出的电子邮件。
hMailServer is a free, open source, e-mail server for Microsoft Windows. It's used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.
It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email.