Let Herald Notify You by hpp Posted on 2010/11/20 Awesome notification plug-in for Apple Mail on your Mac. Herald pops up a small transparent window each time a new e-mail arrives. The tool is free and fairly customisable. This entry was posted in Home, Mac OS and tagged Apple Mail, E-Mail, E-Mail Notification, Freeware, Herald, Mail Plug-in. Bookmark the permalink.