Free Notification Plugin for Mail.app

http://erikhinterbichler.com/software/herald/ 

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Features

• Quick Action Toolbar. Easily perform actions on messages: mark as read, view in Mail, initiate replies, or delete right from within the notification window.
• Customizable Appearance. Adjust window size, position, color, shadow, and transparency.
• Enable Specific Mailboxes. Enable notifications for all mailboxes or only specific mailboxes of your choosing.
• Message Grouping. Messages are grouped into a single notification window to prevent clutter. Flip through messages with a single click.
• View Full Message. A scrollable message window means you can view your full message without having to switch to Mail.
• Automatic or Manual Dismissal. Configure Herald to dismiss notifications after a set period of time or stay on screen until the window is clicked.
• Snow Leopard Compatible. Fully compatible with the latest version of Mac OS X.