When you have groups of people you email on a regular basis, you can create a distribution list for easy email addressing.

To create a group distribution list, you are in the Inbox:
 
1. Open the Address Book. If you don’t see the Address Book button on your toolbar, go to Tools > Address Book…
2. Click File >  New Entry in the Address Contacts window.
 
3. Click New Distribution List
4. Name the List (we’ll call ours “Managers”
5. If you want to add members from your existing address book, click [Select Members…] and double-click on the names to be included in the list. 
  Click Add New to add email addresses not in your address book

To send a message to your Distribution list, choose the list like you would any individual from the list after clicking on [To:] in your message compose window.