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  1. Hi, I am trying to figure out how to connect to office 365 through a proxy server. My application is working well if I connect without a proxy. But now the requirement changed and direct connection to internet is not allowed and I have to use a proxy. I can connect to office 365 from the production machine through proxy using a browser. So the connection setup is good. Now I need to change my application to use a proxy. So I looked around and found that I have to use TIdIOHandlerStack and IdConnectThroughHttpProxy1 to achieve it. But the help document is not that great. So looking for suggestions/help. My code looks like this. type TForm1 = class(TForm) Button1: TButton; IdIMAP: TIdIMAP4; IdConnectThroughHttpProxy1: TIdConnectThroughHttpProxy; IdIOHandlerStack1: TIdIOHandlerStack; Memo1: TMemo; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Button1Click(Sender: TObject); begin IdIMAP.Username := 'test@test.com'; // outlook user name IdIMAP.Password := 'xxxxx'; // outlook user password IdIMAP.Port := 993; // outlook server port IdIMAP.Host := 'outlook.office365.com'; // outlook server IdIMAP.AuthType := iatUserPass; IdConnectThroughHttpProxy1.Host := 'x.x.x.x'; // Proxy server IdConnectThroughHttpProxy1.Port := 1234; // Proxy server port IdIOHandlerStack1.TransparentProxy := IdConnectThroughHttpProxy1; IdIMAP.IOHandler := IdIOHandlerStack1; try Memo1.Lines.Clear; Memo1.Lines.Add('Trying to connect to server...'); if not IdIMAP.Connected then begin if IdIMAP.Connect(false) then Memo1.Lines.Add('Connected to server') else Memo1.Lines.Add('NOT Connected to server') end; Memo1.Lines.Add('Trying to login to server...'); if not(IdIMAP.ConnectionState in [csAuthenticated, csSelected]) then IdIMAP.Login; Memo1.Lines.Add('Logged in to server'); except on E: Exception do begin Memo1.Lines.Add('Error while connecting: ' + E.Message); end; end; end; When I try this, I get "Error while connecting: 403 forbidden error" Thanks for your time, Kind regards, Soji.