it's pretty easy to do this. It took me a while to figure this out though because it is a little counter intuitive.
1. Open Contacts / Address Group
2, Choose New Group from the File menu (Shift, Command, N). Give the group a name you will remember.
3. Enter the names an e-mail addresses for the people you want to send messages.
4. Launch Mail and compose the message. In the To field enter the name of the group you created. Press Send.
If your ISP has a limit on the number of e-mails that can be sent at one time you may need to split the group a few smaller ones.
It is pretty easy. I had been using Mail for quite a while before I started doing that. I have not used that trick in quite a while but it should still work.
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