sending email with unknown values

i already made it work

before
$Name = $this->input->post('Name');
$Email = $this->input->post('Email');
$Company = $this->input->post('Company');
$Host = $this->input->post('Host');
$fo = $this->input->post('fo');
$cc = $this->input->post('cc');

after
$Name = $this->post('Name');
$Email = $this->post('Email');
$Company = $this->post('Company');
$Host = $this->post('Host');
$fo = $this->post('fo');
$cc = $this->post('cc');