Send a private message phpbb

Question

All day trying to solve this, no more. I can log in the forum, read and delete private messages, but to send the business will not.

I need to send a private message via my software in Delphi (xe6). The forum uses phpbb3.

From what I analyzed, phpbb sends the following to send the message:

Post URL: http://site.com/ucp.php?i=pm&mode=compose&action=post&sid=xxxxx

Post Data:
username_list=
icon=0
subject=assunto
message=texto
address_list[u][2]=to
lastclick=xxxx
status_switch=0
post=Submit
attach_sig=on
creation_time=xxxx
form_token=xxx

The values xxx should be captured the moment you send the message, and my program captures these values well, because I put it to save the page and I manually check if the values were correct, and are.

My code:

procedure Envia();
var
  form_token, cr_time, sid: string;
  pp: TStringList;
begin
  //baixo a pagina para pegar os valores (form_token e etc)
  FPageSource.Text := FCon.Get('http://localhost/ucp.php?i=pm&mode=compose&u=2

  //form token
  form_token := TRegEx.Match(FPageSource.Text, 'form_token" value="(\w+)"').Groups[1].Value;

  //creation time
  cr_time := TRegEx.Match(FPageSource.Text, 'creation_time" value="(\w+)"').Groups[1].Value;

  //sid
  sid := TRegEx.Match(FPageSource.Text, 'sid=(\w+)').Groups[1].Value;

  //data
  pp := TStringList.Create;
  pp.Add('username_list=');
  pp.Add('icon=0');
  pp.Add('subject=assunto');
  pp.Add('message=mensagem');
  pp.Add(HttpEncode('address_list[u][2]') + '=to');
  pp.Add('lastclick=' + cr_time);
  pp.Add('status_switch=0');
  pp.Add('post=Submit');
  pp.Add('attach_sid=on');
  pp.Add('creation_time=' + cr_time);
  pp.Add('form_token=' + form_token);

  //enviamos
  FPageSource.Text := FCon.Post('http://localhost/ucp.php?i=pm&mode=compose&action=post&sid=' + sid, pp);

  //O resultado contido em FPageSource é na caixa de entrada das mensagens
  //como se eu NÃO estivesse enviado nada, completamente ignorado.

end;

Final considerations:

• Fcon = Tidhttp
• Fpagesource = Tstringlist
• Httpencode = Unit Httpapp function