si Mail automatically sorts mails by favorites, recipient, category, date and attachments. With si Mail, mails may also be read in HTML format.
The sort function allows the user to mark emails as 'Important', 'Unread', 'Saved', 'To Do', and 'Block'.
si Mail also includes some security features that allow the user to control script execution, attachment downloads, the use of ActiveX features, etc.
Other useful features include automatic attachment file compression and a search feature to look up words and phrases within your account. What's more, with si Mail you can also subscribe to RSS feeds.