error in SQL syntax?

[eluser]anna16[/eluser]
guys

I created a model class called membership.php
and inside it, it has check_email() method.

Code:

function check_email()
  {
    $query = $this->db->query("SELECT email FROM user WHERE email='$this->input->post('email')");
        return $query->result();
  }

I guess this method has an error, can you spot the not of it?

thanks in advanced.