[Andreas]

Can also be implemented as a Pugin.
Hook: register_activate_process

PHP Code:

if (!($userinfo['coppauser'] OR ($vbulletin->options['moderatenewmembers'] AND !$userinfo['posts'])))
{
    $userdata->save();
    $username = unhtmlspecialchars($userinfo['username']);
    if ($vbulletin->options['welcomemail'] AND !$userinfo['posts'])
    {
        eval(fetch_email_phrases('welcomemail'));
        vbmail($userinfo['email'], $subject, $message);
    } 
    $vbulletin->url = "usercp.php". $vbulletin->session->vars['sessionurl'];
        
    eval(print_standard_redirect('registration_complete'));
} 


Please note that this Plugin must be the last one executed on this Hook!