CodeIgniter - how to send email using wamp server? without provide sender email

I am using CodeIgniter and wamp server. I tried to send an email with Gmail email sender, I have got a successfully received email. Using email library.

$this->load->library('email');

But now I need to send email without show sender email, e. i. from the localhost server just provide name of sender without email.

How to send email using localhost mail server without providing an explicit sender email.