Hello, To send an email to many or all of your Yahoo Mail address book contacts at once please follow these steps : Login to your Yahoo Mail account Select the Contacts tab Check the contacts you want to email. There is a convenient check-all link at the bottom of the list. Click the compose new message button at the bottom of your contacts list. Compose and send the new email like any regular email and it will go to all of the contacts. For more help with Yahoo Mail please see our free Yahoo Mail Help forum.