From Eureka Email:
An email client which has a refreshingly new interface and a built-in intelligent junk email filter which eliminates over 95% of spam. As well as filtering junk mail, Eureka Email has a powerful intuitive graphical interface that makes e-mail more interesting to use. Each e-mail is represented by an icon rather than simply being presented in a list. Users can associate a particular icon with a sender, so they can see at a glance who an e-mail is from, and they can even associate particular sounds with a sender if they wish. A powerful one-click searching mechanism means that users can quickly find all e-mails from a particular person, domain name, with the same icon or with the same subject, to follow a 'conversation'.