How to Create an Emailing List in Apple Contacts

Open the Contacts app on your Mac. Click the “View” menu item and select “Show Groups” to display your existing contact groups.
Click “File” and then select “New Group” to create a new untitled group in the Groups pane of the Contacts application.
Click the title of the new group to edit its title. Name the group based on how you associate its contacts to one another; for example, a group for book club members could be titled “Book Club,” while a group for co-workers could be titled 'Work Contacts.'
Click the “All Contacts” item in the Contacts pane. Scroll through the list of contacts and drag entries into the new group. Hold the “Command” key to select multiple entries and then drag them over.
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