IMP H3 (4.1) is now available. This is a major upgrade on top of IMP 4.0.

The major changes compared to the IMP 4.0 versions are:

• Virtual Inbox and Virtual Trash folder.
• "Empty Spam" menu item.
• Stationery and form responses.
• Not necessary to click on "Attach" button when attaching files.
• Play sound on new mail.
• Multiple message view.
• Ability to create notes from email messages.
• Improved message previews.
• Import of photo attachments into a gallery application.
• Send notification when linked attachments are downloaded.
• Graphical representation of thread on thread view screen.
• Encrypt PGP messages for all recipients in one message.
• Always send new messages in "flowed" format.
• Added Hebrew and Khmer translation.
• Compatible with PHP 5.1.
• Auto-detection of namespace information from IMAP server.
• Permission to restrict folder creation.
• Support for changing SMTP server/port on login.
• More flexible custom email headers.

IMP 4.1 requires PHP 4.3.0 or higher, and will operate with version 3.0 or higher of the Horde Application Framework.