Calling all Growl experts...! I need your help and expertise. Here's what I'd like to do - I would like to be able to configure Growl to pop up a notification when an email is received from a specific sender. But I'm not quite sure where to even begin (other than having Growl installed). I have a desktop machine at home that's always running and connected to the 'net, so it could run anything necessary. It's not a Google mail account, so Google Notifier isn't an option, but virtually any other method would be ok. I have Apple's Mail client running in the background at all times on this machine if that's a good starting place. Any advice?