When you’re sending an email to a group that you’ve put together in Address Book, there are many ways to do it. For example, you can right-click on the group and choose Send Email to [Group Name].
Or you can open the Address Panel in Mail (Option-Command-A or Window > Address Panel) and either double-click a group name or select one and use the To:, Cc:, or Bcc: button to put things exactly where you want ’em.
I think by far the easiest way—and certainly the quickest!—is to just type the name of the group itself into a recipient field in your message.
When you hit Enter after doing that, all of the group’s addresses will fill in automatically.
Look, just pretend you can see them, OK?
That’s neat, but there are some other related considerations when you’re emailing groups. We already know that we should use Bcc: for sending to multiple people, right? Especially those who don’t know each other? Using the Bcc: (blind carbon copy) field will hide all of the addresses from the recipients, so you don’t have to worry about sending your mom’s email address to your creepy landlord if you need to include them both in a message. If you start composing an email and don’t see Bcc: at all, select the three-lined Customize button (pictured below) and click to add that field in.
Additionally, a hidden Mail setting can help with sending to groups. If you go to Mail > Preferences and click on the Composing tab, you can toggle off When sending to a group, show all member addresses.
From then on, any emails you send to a group will automatically have the addresses hidden, even if you forget to put them into the Bcc: field.
Remember, though, that this only works with Address Book groups. If you’re just sending a message to multiple people, don’t forget to use blind carbon copy. Trust me, your friends will thank you. Heck, I’ll thank you.