Here's the ultimate mail notifier:

									Biff

What is Biff?
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I use procmail to filter my incoming mail right into different Mailboxes. This used to work fine on OpenStep, thanks to EnhanceMail.bundle wich displayed the number of unread mails in the Mailboxes panel.

Now, on Mac OS X Server, MailViewer.app does the display of unread mails in closed mailboxes lazily, i.e. you will not see unread mails in mailboxes other than Active.mbox unless you open the mailbox.

Biff checks the table_of_contents to see if new mail arrived in the mailboxes and displays an icon with a menu (containing the mailboxes with unread Mail) in the status bar of the Workspace.

Credits
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Thanks to Erik Dörnenburg for the NSStatusBar code snippet. 

Biff uses mailtoc.[hc] from the fabulous mailapp-utilities, so lots of thanks to Tom Hageman (who is the current maintainer of mailapp-utilities).
