namespace OutlookEmailListener;

using Outlook = Microsoft.Office.Interop.Outlook;

internal class Program
{
    static void Main(string[] args)
    {
        Outlook.Application outlookApp = new Outlook.Application();
        Outlook.MAPIFolder inbox = outlookApp.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);
        Outlook.Items items = inbox.Items;
        items.ItemAdd += new Outlook.ItemsEvents_ItemAddEventHandler(OnNewMail);

        Console.WriteLine("Press any key to exit...");
        Console.ReadKey();
    }

    private static void OnNewMail(object item)
    {
        if (item is Outlook.MailItem mail)
        {
            Console.WriteLine("New mail received: {0}", mail.Subject);
        }
    }
}