Tray Helper it's compact award winning application with many features (f/e: email checker, auto mail responder, anti-spam, popup-killer, event reminder and more).
There was a new version (4.0) released recently (February 18, 2004) with following changes:

- When you send message to multiple recipients with a tracking tag - TH can split this message and send it to each recipient separately so you can track when every separate message is read.
- Improved storage and management of mail filters - now TH requires less resources and loads faster.
- Added option to change default SMTP port for each e-mail account.
- Added feature to move messages from POP3 to local folder with a one click.
- It's easier now to add multiple attachments. You can not only select multiple files from file dialog, but also drag files from explorer-like applications and drop it at "Send email" dialog of Tray Helper.
- Thanks to optimization of resources - application is now more compact and has lower memory requirements.
- It's much easier now to control application via keyboard (added many keyboard shortcuts etc.).
- MS Agent characters can now read content of incoming e-mails. If you prefer to hear messages than read them - you will find this feature quite useful.
- Removed few bugs and added some less important features.