Is there a way to drag a list of emails from MacEmail into a group in MacAddressBook
do you must to drag them individually into AllContacts
(1a) In Mail, select messages, then Message > Add Senders to Address Book; or,
(1b) In Mail, Window > Previous Recipients, then select addresses, click Add to Address Book.
(2) In Address Book, create a new group, select contacts, drag to group. Or use Smart Group.