Comment 2 for bug 733488

I've been thinking about this a little bit too. In addition to turning the indicator blue for messages marked as important, we could also check if the mail is addressed directly to the recipient (this would filter out high-volume mailing list traffic unless those are explicitly addressed to you). We could also do other things, eg, check if the sender is in the recipients addressbook.

Anyway, just some random thoughts. I'll probably experiment with some of these next week