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Turkish Language character problem when sending e-mail using indy 10

Hi,
Below is the code Delphi BDS 2006 Indy 10. When i send e-mail using Turkish language character i get incorrect wiew on e-mail client side.

On MS Outlook 2007 :

Subjet : ýýýý ÜÜÜ ÞÞÞ ÇÇÇ ÝÝÝ ÐÐÐ ÖÖÖ ööö ððð ççç þþþ
Body : iiii ÜÜÜ SSS ÇÇÇ III GGG ÖÖÖ ööö ggg ççç sss

On Yahoo :
Subject : ýýýý ÜÜÜ ÞÞÞ ÇÇÇ ÝÝÝ ÐÐÐ ÖÖÖ ööö ððð ççç þþþ (incorrect view)
Body : ¿¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ ¿¿¿ (incorrect view)

How can i fix this problem? I want to send e-mail using Turkish language character and make sure that my e-mail is viewed on client side correctly.(correct Turkish language character are attached on jpeg file. )
Thanks in advance.

procedure TForm1.Button1Click(Sender: TObject);
var Temp : String;
   mailMessage : TIdMessage;
   SMTPConnection : TIdSMTP;
   tempCharSet : String;
   tempEncoding : char;
   tempTransfer : TTransfer;
begin
  Screen.Cursor := crHourGlass;//mouse bekleme

  try
      mailMessage    := TIdMessage.Create;
      SMTPConnection := TIdSMTP.Create;

      mailMessage.ClearHeader;

   //   tempCharSet  := 'ISO-8859-9';
     // tempEncoding := 'B';
    //  tempTransfer := bit8;
    //  mailMessage.InitializeISO(tempTransfer,tempEncoding,tempCharSet);

      mailMessage.ContentTransferEncoding := '8bit';
      mailMessage.CharSet                 := 'ISO-8859-9';


      with mailMessage do
      begin
         Clear;
         From.Text                 := _fromEMail;
         From.Name                 := _fromName;
         ReplyTo.EMailAddresses    := '';
         Priority                  := mpNormal;
         Recipients.EMailAddresses := _toEMail;
         Subject                   := 'iiii ÜÜÜ SSS ÇÇÇ III GGG ÖÖÖ ööö ggg ççç sss';
      end;
      mailMessage.Body.Clear;
      mailMessage.ContentType := 'text/html';
      mailMessage.Body.Add('<html>');
      mailMessage.Body.Add('<head></head>');
      mailMessage.Body.Add('<body>');
      TEMP := mailMessage.Subject;
      mailMessage.Body.Add(TEMP);
      mailMessage.Body.Add('</body>');
      mailMessage.Body.Add('</html>');


      SMTPConnection.Username := _userName;
      SMTPConnection.Password := _userPass;
      SMTPConnection.Host     := _serverName;
      SMTPConnection.Port     := _serverPort;

      {now we send the message}
      SMTPConnection.Connect;
      try
         SMTPConnection.Send(mailMessage);
      finally
         SMTPConnection.Disconnect;
      end;
  finally
      SMTPConnection.Free;
      mailMessage.Free;
  end;
  Screen.Cursor := crDefault;//mosue normal
end;

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CorrectCharacters.jpg