Enviar Email con MAPI y los campos cc y bcc (o cco)

[Durbed]

Tengo una función que envia un email mediante el MAPI a un lista de direcciones, pero solo he conseguido meterlas en el campo "to" (para), y ahora me han pedido, que meta algunas direcciones en el campo bcc (cco), para que los destinatarios de los emails no vean a quien mas fue enviado.

La función es:

Código Delphi [-]
function SendEMail(Handle: THandle; Mail: TStrings): Cardinal;
type
  TAttachAccessArray = array [0..0] of TMapiFileDesc;
  PAttachAccessArray = ^TAttachAccessArray;
var
  MapiMessage: TMapiMessage;
  Receip: TMapiRecipDesc;
  Attachments: PAttachAccessArray;
  AttachCount: Integer;
  i1: integer;
  FileName: string;
  dwRet: Cardinal;
  MAPI_Session: Cardinal;
  WndList: Pointer;
begin
  dwRet := MapiLogon(Handle,
    PChar(''),
    PChar(''),
    MAPI_LOGON_UI or MAPI_NEW_SESSION,
    0, @MAPI_Session);

  if (dwRet <> SUCCESS_SUCCESS) then
  begin
    MessageBox(Handle,
      PChar('Error Al intentar mandar el Email'),
      PChar('Error'),
      MB_ICONERROR or MB_OK);
  end
  else
  begin
    FillChar(MapiMessage, SizeOf(MapiMessage), #0);
    Attachments := nil;
    FillChar(Receip, SizeOf(Receip), #0);

    if Mail.Values['to'] <> '' then
    begin
      Receip.ulReserved := 0;
      Receip.ulRecipClass := MAPI_TO;
      Receip.lpszName := StrNew(PChar(Mail.Values['to']));
      Receip.lpszAddress := StrNew(PChar('SMTP:' + Mail.Values['to']));
      Receip.ulEIDSize := 0;
      MapiMessage.nRecipCount := 1;
      MapiMessage.lpRecips := @Receip;
    end;

    AttachCount := 0;

    for i1 := 0 to MaxInt do
    begin
      if Mail.Values['attachment' + IntToStr(i1)] = '' then
        break;
      Inc(AttachCount);
    end;

    if AttachCount > 0 then
    begin
      GetMem(Attachments, SizeOf(TMapiFileDesc) * AttachCount);

      for i1 := 0 to AttachCount - 1 do
      begin
        FileName := Mail.Values['attachment' + IntToStr(i1)];
        Attachments[i1].ulReserved := 0;
        Attachments[i1].flFlags := 0;
        Attachments[i1].nPosition := ULONG($FFFFFFFF);
        Attachments[i1].lpszPathName := StrNew(PChar(FileName));
        Attachments[i1].lpszFileName :=
          StrNew(PChar(ExtractFileName(FileName)));
        Attachments[i1].lpFileType := nil;
      end;
      MapiMessage.nFileCount := AttachCount;
      MapiMessage.lpFiles := @Attachments^;
    end;

    if Mail.Values['subject'] <> '' then
      MapiMessage.lpszSubject := StrNew(PChar(Mail.Values['subject']));
    if Mail.Values['body'] <> '' then
      MapiMessage.lpszNoteText := StrNew(PChar(Mail.Values['body']));

    WndList := DisableTaskWindows(0);
    try
    //Result := MapiSendMail(MAPI_Session, Handle,
    //  MapiMessage, MAPI_DIALOG, 0);
    Result := MapiSendMail(Mapi_Session, Handle, MapiMessage, MAPI_LOGON_UI, 0);
    finally
      EnableTaskWindows( WndList );
    end;

    for i1 := 0 to AttachCount - 1 do
    begin
      StrDispose(Attachments[i1].lpszPathName);
      StrDispose(Attachments[i1].lpszFileName);
    end;

    if Assigned(MapiMessage.lpszSubject) then
      StrDispose(MapiMessage.lpszSubject);
    if Assigned(MapiMessage.lpszNoteText) then
      StrDispose(MapiMessage.lpszNoteText);
    if Assigned(Receip.lpszAddress) then
      StrDispose(Receip.lpszAddress);
    if Assigned(Receip.lpszName) then
      StrDispose(Receip.lpszName);
    MapiLogOff(MAPI_Session, Handle, 0, 0);
  end;
end;

Y la llamada la realizo asi:

Código Delphi [-]
  ...   
  mail := TStringList.Create;
  For i := 0 To LBPara.Items.Count -1 Do
    destinatarios := destinatarios + LBPara.Items.Strings[i] + ', ';
  destinatarios := copy(destinatarios,1 , length(destinatarios)-2);
  try
    mail.values['to'] := destinatarios;
    mail.values['subject'] := EdAsunto.Text;
    mail.values['body'] := MCuerpo.Text;
    For i := 0 to LBAdjuntos.Items.Count -1 Do
      mail.values['attachment' + IntToStr(i)] := LBAdjuntos.Items.Strings[i];
    sendEMail(Application.Handle, mail);
  finally
    mail.Free;
  end;

Me da que debe ser una chorrada que se me ha debido pasar, pero bueno ya saben lo que dicen, 1000 ojos ven mas que dos

PD: La funcion no es mia, yo solo la he realizado pequeñisimos retoques, pero no me acuerdo de donde la saque, así que pido perdon al autor por no acordarme de el.

Un saludo y gracias