If you use Groups in Address Book, you can use the name of the group in the TO: field of your email message and the message will be sent to all of the members of the Group.
For example, I have an Address Book Group called "_Family". By typing "_Family" in the TO: field, my message goes to my parents, siblings, in-laws, etc.
Note: Sending to a Group works like using BCC: for your addresses-- the recipients do not see who else received the message.
Addressing the email to a group Click to see a larger image
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