IMP Features (as of IMP 4.0)

• Spell checking
• Mail filtering (must install ingo module)
• Message searching
• Many Mime viewers (over ?)
• Encrypting, signing, decrypting and verifying of signed and encrypted messages (PGP/GPG and S/MIME)
• robust/comprehensive/easy-to-use UI
• Full charset support in folders, mailbox, message and compose views
• Mail folders in the left menu
• Preview of attachments in compose view
• Send attachments as links
• Option to not save attachments with sent mail
• Navigation through message and mailbox views with arrow keys
• View all messages of a thread
• HTML message composition with a cross-browser WYSIWIG editor
• Fetching mails from other email accounts to view with IMP
• Message previews in mailbox view
• Management of shared IMAP folders
• Priority settings for composed messages
• User management for supported IMAP servers
• Integrated quota support
• Support for mailing list headers
• Ability to forward multiple messages at once
• Downloading of all attachments from a message as a single ZIP file
• Stripping individual attachments from messages
• Alias and "tied to" addresses in user identities
• Graphical emoticons and country flags in message view
• IMAP mailbox subscription support
• Available in many languages