PopTray is a free, opensource full-featured, customizable, e-mail notifier. Includes Spam management using rules and white/black lists.
Other Features include:
- Unlimited number of Accounts.
- Check mail from multiple accounts on a timer interval.
- Message Preview.
- Delete messages directly from the server.
- Plug-in Support: Protocol plug-ins (e.g. IMAP4, POP3SSL, Hotmail, etc.)
- Multi-lingual, translated into 30+ languages.