PopTray

PopTray is a little open source POP3 mail checker.

Features:

- unlimited number of Accounts.
- show number of messages directly on the TrayIcon.
- quickly preview a message.
- delete messages from the server without downloading them.
- configurable hot-keys/mouse-buttons/command-Line options.
- spam management using rules and white/black lists.
- mulitple notfications (play sound, pop-up, etc).
- and much more...