Sure...
$to = "email@address.com";
$subject = "subject of email";
$body = " This is where the body of my email goes.";
$header = "From: me@myaddress.com\nBcc: another@address.com";
mail($to, $subject, $body, $header);
You can add a lot of info the the 'header' tag in the email function...
You could also just loop through it and send one copy per person you are trying to reach, and not use t he Bcc field.
-- Jason