I've noticed that if I click on certain contacts, I can view my most recent "interactions" with them. Some of these interactions (emails) are highlighted in BOLD as if they have not been read yet while some of my messages to them are not highlighted. Is this a feature showing whether or not my sent emails have been read or not??? That would be my assumption...but I'm really not all that familiar with the inner workings of gmail. Thank you for any feedback I can get!