Nope, we're not there yet, just checked my aw messages and I have a couple the are underlined and in italics and they are part of an exchange in messages with a pro$$ie.
So, we still not got the right answer beano
Non italics and not underlined means they have read your message but not deleted it from their inbox
Underlined and in italics means they have read your message and deleted it from their inbox
Blank means its not been read
The word deleted means it's been deleted without being read
That they are part of an email dialogue isn't a factor. She can read, reply then delete from her inbox. The full exchange still exists until you delete it from your inbox too