如何使用C#放置电子邮件的发件人，我的outlook应用程序中有3封电子邮件

using Outlook = Microsoft.Office.Interop.Outlook;

Outlook.Application outlookApp = new Outlook.Application();

Outlook.Account account = outlookApp.Session.DefaultAccount;

Outlook.MailItem mailItem = outlookApp.CreateItem(Outlook.OlItemType.olMailItem) as Outlook.MailItem;

mailItem.Sender = account.CurrentUser;

mailItem.Subject = "邮件主题";
mailItem.To = "收件人邮箱";
mailItem.Body = "邮件正文";

mailItem.Send();

using Outlook = Microsoft.Office.Interop.Outlook;

class Program
{
    static void Main(string[] args)
    {
        Outlook.Application outlookApp = new Outlook.Application();
        Outlook.Account account = outlookApp.Session.DefaultAccount;

        Outlook.MailItem mailItem = outlookApp.CreateItem(Outlook.OlItemType.olMailItem) as Outlook.MailItem;
        mailItem.Sender = account.CurrentUser;
        mailItem.Subject = "邮件主题";
        mailItem.To = "收件人邮箱";
        mailItem.Body = "邮件正文";
        mailItem.Send();
    }
}