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$_CONF['usersubmission']  = 0; // 1 = new users must be approved
(...)
// When user submission is activated, allow users from these domains to
// register without having to go through the submission queue.
$_CONF['allow_domains'] = ''; // e.g. 'mycompany.com,myothercompany.com'
 

function COM_isEmail( $email )
{
    if (function_exists('custom_emailblacklist'))
    {
        if (custom_emailblacklist($email))
        {
            return FALSE;
        }
    }
// rest of COM_isEmail continues here.
}
 

// custom_emailblacklist returns TRUE if the $email address matches a pattern on the blacklist
function custom_emailblacklist( $email )
{
    if (strpos($email, 'somebad.address') !== FALSE or
        strpos($email, 'someother.address') !== FALSE or
        strpos($email, 'athird.address') !== FALSE)
    {
         return TRUE;
    }
    return FALSE;
}
 

function custom_emailblacklist($email)
{
    $blocking = Array(
        'mail.ru',
        'cashette.com',
        'yandex.ru',
        'ya.ru',
        'gold-profits',
        'gawab.com'
        // I've eliminated the ones with curse words in them
    );
    foreach ($blocking as $addr) {
       if (strpos($email, $addr) !== FALSE) {
            COM_accessLog("tried to register $email");
            return TRUE;
        }
    }
    return FALSE;
}