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 (4.1) released recently (April 03, 2004) with following changes:

- It's possible now to define a string that will be auto added to subject of every outgoing e-mail.
- Build in calendar checks the local system to determinate if display Sunday as a first or last day of the week.
- Some cleaning up in configuration menu.
- Columns in e-mail lists are now fully customizable.
- Added grid lines to all list controls of application (it can be turn off at configuration tab of application).
- When you start external e-mail reader from application - application auto minimizes to system tray.
- Fixed performance problem with decoding large attachments.
- Forward messages with attachments can be done now with one click.
- Maximum number of handled e-mail accounts was increased to 100.
- Removed few bugs and added some less important features.