oundCube Webmail是一个基于浏览器，支持多国语言的IMAP客户端，操作界面看起像一个桌面应用程序。它提供一个e-mail客户端应该具备的所有功能包括 MIME支持,地址薄，文件夹操作，信息搜索和拼写检查。RoundCube Webmail采用PHP+Ajax开发并且需要MySQL数据库来存储数据。 用户界面采用XHTML+CSS2设计。
特性：
- 支持超过 70 中语言
- Drag-&-drop message management
- Full support for MIME and HTML messages
- Sophisticated privacy protection
- Compose messages with attachments
- Multiple sender identities
- Full featured address book with groups and LDAP connectors
- Find-as-you-type address book integration
- Richtext/HTML message composing
- Forwarding messages with attachments
- Searching messages and contacts
- Threaded message listing
- IDNA support
- Spell checking
- Canned response templates
- IMAP folder management
- Shared/global IMAP folders
- Support for external SMTP server
- Support for access control lists (ACL)
- Built-in caching for fast mailbox access
- Unlimited users and messages
- Import/export functions
- Template system for custom skins
- Plug-in API for flexible exensions
服务器要求：
- Apache, Lighttpd, Nginx, Cherokee or Hiawatha web server
- PHP Version 5.2.1 or greater
- MySQL, PostgreSQL, SQLite or MSSQL database
- An IMAP server which supports IMAP4 rev1
- An SMTP server (recommended) or PHP configured for mail delivery
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