codice:
<form action="http://auth.cp.virgilio.it/mail/phoenixlogin" method="post">

  <input type="hidden" name="style" value="webmail_IT" />

  Email: <input type="text" name="userid" />

  Password: <input type="password" name="password" />


  <input type="reset" name="CANCELLA" /> <input type="submit" name="ENTRA" /> 

</form>

a me funziona egregiamente.