IMP是一个WebMail系统，支持IMAP和POP3邮件服务器。提供了一系列功能通常只在桌面电子邮件客户端见到。包括：

• Dynamic (AJAX) view
• Mobile smartphone view
• Minimal (text-only) view
• HTML message composition with a cross-browser WYSIWYG editor
• Drag/drop attachment support into WYSIWYG editor
• HTML signatures
• High performance
• Robust IMAP support, utilizing advanced server features
• Flexible message search
• Address autocompletion
• Spell checking
• Sending of attachments via download link, instead of embedding in message
• Thread view
• Message previews in mailbox view
• Desktop like user interface and navigation (also via keyboard)
• IMAP folder support
• Management of shared IMAP folders (ACLs)
• Folder subscriptions
• Various identities
• Alias and "tied to" addresses in user identities
• Integration with e-mail filtering
• Integration with addressbook
• Integration with calendar
• S/MIME and PGP based encryption and signatures
• Mailbox quotas
• Ability to forward multiple messages at once
• Download of attachments as ZIP archive
• Stripping of attachments from messages
• Preview of attachments in compose view
• Priority settings for composed messages
• Message flags
• Graphical emoticons and country flags in message view
• Available in many languages
• Full charset support

项目主页：http://www.open-open.com/lib/view/home/1384932826837