Looking for the opposite of "banned emails"

[JMikeS]

This doesn't work with 3.6, any suggestions? The original function is:

PHP Code:

// ###################### Start checkbannedemail #######################
function is_banned_email($email)
{
    global $vbulletin;

    if ($vbulletin->options['enablebanning'] AND $vbulletin->banemail !== null)
    {
        $bannedemails = preg_split('/\s+/', $vbulletin->banemail, -1, PREG_SPLIT_NO_EMPTY);

        foreach ($bannedemails AS $bannedemail)
        {
            if (is_valid_email($bannedemail))
            {
                $regex = '^' . preg_quote($bannedemail, '#') . '$';
            }
            else
            {
                $regex = preg_quote($bannedemail, '#') . ($vbulletin->options['aggressiveemailban'] ? '' : '$');
            }

            if (preg_match("#$regex#i", $email))
            {
                return 1;
            }
        }
    }

    return 0;
}