5、Zmailer

 　　ZMailer是一个高性能、多进程的Unix系统邮件程序。

优点：单块模式设计，Hotmail等邮件系统就是用Zmailer构建的

缺点：技术文档较少。

官方站点：http://www.zmailer.org/

最新版本：2.99.57

　　6、Sun Java Communications Suite（Sun Java通讯套件）

 　　July 25, 2008—This week Sun announces the availability of Java Communications Suite 6, which includes the new Convergence web client, push e-mail support, and many more new features. The new capabilities make Communications Suite 6 an even stronger alternative to Microsoft Exchange.

 　　Provides industry-leading email and message management, calendaring and group scheduling, time and resource management, and real-time collaboration services.A standards-based, extensible platform for application development backed by a rich network of ISV partners.Offers improved performance, reliability and scalability at a lower TCO.Simple, subscription-based pricing includes support.

 　　New Feature:

            1、State-of-the-art AJAX Web 2.0 client experience  
            2、Mobile messaging: wireless "push" email 
            3、Mobile synchronization of calendar/contacts 
            4、Rich assortment of clients available 
            5、Support for very large mailboxes
            6、Convergence, a complete Ajax/Dojo web client 
            7、Subscription-based pricing model for point products 
            8、Messaging, mailbox, and instant messaging enhancements 
            9、Outlook connectivity including Vista support 
            10、Entirely new Communications Suite installer 
            11、Service tags support  

Sun Java Communications Suite包含以下组件

Sun Java System Calendar Server 日历服务
Sun Java System Messaging Server 信息服务
Sun Java System Instant Messaging 即时信息
Sun Java System Connector for Microsoft Outlook Microsoft Outlook连接器
Sun Java System Communications Sync 通讯同步
Sun Java System Communications Express 通讯快递
Sun Convergence 聚合 

优点： 企业级通讯部署，管理。是Microsoft Exchange的强有力竞争对象。

缺点：技术难度较高，支持文档较少。

官方站点：http://www.sun.com/

最新版本：2008-7-25 6.0

(责任编辑：admin)