[kh99]

Yeah, there is a number of issues with that. One is, like you said, the phrases aren't used in a template so you can't use template tags. Also, $bbuserinfo will be the info for the user who posted the post, not the one receiving the mail. And it looks like the code that sends the mail is complicated by the fact that it allows for multiple languages. But if you can figure out how to deal with that, there's a newpost_notification_message hook location right before the message is completed where you might be able to do something along the lines of

if (is_member_of($touser, 5,6))
{
    // set things for admin email
}
else
{
    // set things for user email
}

See function exec_send_notification() in includes/functions_newpost.php.

BTW, I know this isn't the programming forum, but I'm not sure what else I can tell you...