Available in over 70 languages
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 extensions