I know I can check whether a mail is read/not read by the addressee. I also know that I can have notification about the opened mails. I use the latter in Banners mode which is perfect for most of the time. But sometimes I find myself constantly checking a given mail whether it was opened or not. I either keep it open on my desk, or checking the mail in the sent folder.

Is it possible to ask for Alert notification when a given mail is opened when the default notification is Banners?

Is there maybe any other idea how to get notified about a given mail? Rules or something...