// C#示例代码
using Microsoft.Exchange.WebServices.Data;

public string GetSenderEmailAddress(ExchangeService service, string itemId)
{
    // 绑定到特定的邮件项
    EmailMessage email = EmailMessage.Bind(service, new ItemId(itemId));
    
    // 获取发件人信息
    return email.Sender.Address;
}

// C#使用MAPI/CDO示例
using CDO;

public string GetSenderEmailAddress()
{
    Session session = new Session();
    session.Logon(null, null, false, true, 0, true, "");
    
    Messages messages = session.Inbox.Messages;
    Message message = messages.GetFirst();
    
    // 获取发件人信息
    AddressEntry sender = message.Sender;
    return sender.Address;
}

// EWS批量获取示例
ItemView view = new ItemView(10);
PropertySet props = new PropertySet(BasePropertySet.IdOnly, EmailMessageSchema.Sender);
FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, view);

foreach (Item item in results)
{
    EmailMessage email = (EmailMessage)item;
    Console.WriteLine(email.Sender.Address);
}