Mail Notification is a status icon (aka tray icon) that informs you if
you have new mail.

It works with system trays implementing the freedesktop.org System Tray
Specification, such as the GNOME Panel Notification Area, the Xfce
Notification Area and the KDE System Tray.

Mail Notification features include:

* Multiple mailbox support.
* Mbox, MH, Maildir, Sylpheed, POP3, IMAP and Gmail support.
* SASL authentication support.
* APOP authentication support.
* SSL/TLS support.
* Automatic detection of mailbox format.
* Immediate notification (the status icon is updated within seconds after
  a mailbox changes).
* HIG 2.0 compliance.