Internet Drummer! - description from Softdepia.com:
This program works in the system tray and serves for checking unlimited number of POP3 e-mail accounts. It can execute various types of notifiers whenever there is new e-mail waiting in your mailbox. Each e-mail account can have its own checking interval. You can preview messages while they are still on server and decide which messages to keep and which should be removed immediately. You can set a list of spam filtering conditions and program will automatically remove such messages. You can also set a list of friendly e-mail notifying conditions and get extra notification when such messages arrive. Program also allows you to maintain a list of web pages it should periodically visit and check for changes. Whenever it detects a change on a web page you will be notified by selected notifier and/or automatic web browser launch.
Internet Drummer! is a "Free to try" program. You can download and try it for an evaluation period.