Koma-Mail è un client di posta elettronica standalone, da portare in giro sul proprio pendrive, ma davvero completo di funzionalità:

• POP3, IMAP, SMTP, WebDav
• SSL and APOP support
• RSS viewer
• Calendar
• Contact management
• Displays HTML Mails
• HTML-Editor for composing
• Sends and receives mail with inline images
• Zips attachments automatically
• Mails can be marked with colors
• Free folder structure
• Automatically cleans folders
• Template module
• Several user accounts
• Several mail accounts per user account
• Encrypts user accounts
• Spam filter (including Bayesian)
• Filter module
• Unicode support