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add_filter('woocommerce_email_recipient_b2bking_new_message_email', 'b2bking_filter_conversation_email_recipients', 1000, 2);

function b2bking_filter_conversation_email_recipients($recipient, $order) {
    // If no recipient, return empty
    if (empty($recipient)) {
        return $recipient;
    }
    
    // Check if the recipient is an admin or shop manager
    $user = get_user_by('email', $recipient);
    
    if ($user) {
        // Check if user has admin or shop manager capabilities
        if (user_can($user, 'manage_options') || user_can($user, 'manage_woocommerce')) {
            // User is admin or shop manager, allow email
            return $recipient;
        } else {
            // User is not admin/shop manager, block email 
            return '';
        }
    } else {
        return '';
    }
}