1. Select a registered group from the "Address Book" window.
2. Click "Compose" button or choose "Compose a new message" from right-click menu while selecting a group you want to send a mail to.
3. A mail composing window opens. Click "Send" button after you finish composing a message since a group you selected is set in "To" field automatically.
* You can specify multiple groups to "To" or "Cc" by selecting all groups to which you want to send a mail while pressing a shift or a control key.