Tray Helper it's freeware, 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 (4.4) released recently (August 22, 2004) with following changes:

- Added SSL support for e-mail connections (sending and receiving messages).
- Improved e-mail tracking - added support of Outlook like read notifications.
- Added ability to arrange order of e-mail accounts.
- Many major improvements in user interface.
- Fixed bug with wrong direction of sorting lists.
- Improved algorithms of sending e-mails (RFC compability fix).
- SWEDISH language support -> Thanks to: Stig Larsson [ translator@eskils.org ]
- Some serious imporvements in international character conversions.
- Much faster access to messages stored in e-mail folders.
- Added configuration wizard on first run of application.