Using Daylite 3.6 and whatever version of DMI comes with it.

Pick on a message that is sent by someone not in Daylite and you get "Add to Daylite" button.

Pick on message with a contact in Daylite in any of the main to / from fields and they appear in the side bar.

But click on a message that has a mix of people in Daylite and people not in Daylite and you only get the list of people in Daylite showing in sidebar.

It would be great to know how I can get notification of a mix of people in / out of Daylite in message header within Mail - and / or have it show me a button to trigger adding missing people whenever there is such in a mail message.

Right now presence of anyone in Daylite in CC field for example makes it impossible to get DMI to assist in transferring contact details into Daylite.

Is this a shortcoming in the app, or am I just missing something obvious?

It's something to submit as a feature request.