experimenta estas classes:
http://rapidshare.de/files/14820292/classes.rar
depois é só fazeres algo deste genero:
function enviaAviso($user,$ids,$email,$user2)
{
include("class.smtp.php");
include("class.phpmailer.php");
$mail = new PHPMailer();
$mail->IsSMTP(); // set mailer to use SMTP
$mail->Host = "servidor de email"; // specify main and backup server
$mail->SMTPAuth = true; // turn on SMTP authentication
$mail->Username = "user"; // SMTP username
$mail->Password = "pass"; // SMTP password
$mail->From = "email";
$mail->FromName = "Nome";
$mail->AddAddress($email, $user2);
$mail->WordWrap = 50; // set word wrap to 50 characters
$mail->IsHTML(true); // set email format to HTML
$mail->Subject = "Assunto";
$mail->Body = "Corpo";
$mail->AltBody = "Corpo";
if(!$mail->Send())
{
echo "Message could not be sent. <p>";
echo "Mailer Error: " . $mail->ErrorInfo;
exit;
}
$mail = $email;
return "OK";
}