Is the email template in html? If so you may have a problem and might need to install a free hack that you can do a search for on here. I do not remember the name of it off hand, but there is one to help you send out mass e-mails with html from the admin cp. If your e-mail is not in html then you should be able to do it straight from your admincp area.
1. Login to your admin panel
2. Scroll down on your left side column menu until you reach "Users" Expand it if its not expanded.
3. Click the "Send email to users link"
That should get you going in the right direction.
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