So you’re now using Apple’s built-in Contacts which is Apple’s version of an Address Book. Congratulations. It pretty much does the same thing, stores and manages your contacts for you on your Mac and iOS devices which can be synced via iCloud.
Those of you coming from another email service may be familiar with using a “mailing list”, “distribution list”, “email list”, “groups” or just “list” or something similar depending on what service you were using. Whatever you called it, the function is the same… it allows you to email a specific group of contacts without having to enter each contact, individually, in your “to” field. This is easily achieved in Apple’s Contacts application by use of “Groups”.
How to Create Groups in Contacts (macOS)
Open your Contacts application and hover your cursor over the “iCloud” section, a “+” plus sign will appear near it… clicking it will allow you to create a group and title it accordingly, you can then go to the section titled “All Contacts” and begin dragging specific contacts to the newly created group.
When your done editing your group, compose a new message in Mail and rather than typing in individual email addresses in the “To” field, simply type in the Group name (which you just created) and all the contacts in that group will propagate the “To” field.