This isn't what I asked for. I do see this functionality now that I've upgraded to a newer version of SM, but this doesn't really meet the need. Let me provide an example of what I'm looking for...
A friend sends an email to a group of people including me. I want to be able to quickly see which of the other people in the email (whether in To or CC), are already in my Contacts so that I can add the people that are missing if they are someone I want in my contacts.
While this does now indicate if the sender is in my contacts, it doesn't address any of the other folks included in the email. It also, still displays Add Contact for the sender in the right-click menu even though that user is already a contact. It should switch to Edit Contact.
Owner of Efficion Consulting