Mail.dll通過代理C＃

Question

我有以下任務：我應該閱讀從Gmail的電子郵件和計算機通過代理連接到互聯網。通常我會用mail.dll http://www.lesnikowski.com/mail這樣的：

using (Imap imap = new Imap()) 
    { 
     imap.ConnectSSL(_server); 
     imap.Login(_user, _password); 

     // Select the Inbox folder, ou can also select other folders. 
     // E.g. Sent folder: imap.Select("Sent"); 
     imap.SelectInbox(); 

     // Find all unseen messages: 
     List<long> uidList = imap.Search(Flag.All); 


     // Download each message: 
     foreach (long uid in uidList) 
     { 
      IMail email = new MailBuilder().CreateFromEml(
       imap.GetMessageByUID(uid)); 

      // Display email data, save attachments: 
      ProcessMessage(email);      
     } 
     imap.Close(true); 
    } 

，但我應該在需要時出現的代理和授權怎麼辦？
謝謝你的幫助！