mail notification in system tray

 mail-notification works with system trays implementing the
 freedesktop.org System Tray Specification, such as the GNOME Panel
 Notification Area, the xfce4 Notification Area and the KDE System Tray.
 .
  Mail Notification features include:
   * multiple mailbox support
   * mbox, MH, Maildir, Sylpheed, POP3, IMAP, Gmail and Evolution support
   * Mozilla products (Mozilla, SeaMonkey, Thunderbird, ...) mailbox support
   * SASL authentication support
   * APOP authentication support
   * SSL/TLS support
   * automatic detection of mailbox format
   * immediate notification (depends on your settings)
   * HIG 2.0 compliance
 .
  Note: Evolution support is available with mail-notification-evolution.