Here are some key features of "Portable si.Mail":

· Localization
· Html message view
· MAPI, e-mail aliases support
· Control downloading of images, executing scripts, using ActiveX contros in html messages
· Theme support
· POP3, SMTP, SMTP AUTH, NTLM support for both POP3 and SMTP access through plug-ins
· Multiple account support
· Preview mail on Server
· Automatic attachment compression
· Colorize possible dangerous extensions
· Remove of dangerous html tags before putting message to html viewer
· Multiple profile support under one Windows account(profile)
· Plug-in support for importing and exporting of messages and address book
· Use anti-virus application to verify attached files before open/save
· SSL & TSL connection
· Use plug-ins and view / print attached files directly from si.Mail
· Store attachments in separate folder, so messages file can be smaller up to 33%
· Advanced message search
· Advanced pre-download, after-download and after-send filters
· RSS, Atom feeds support
· Minimize to system tray