1) double check the trigger you are using. You have selected Currant page submit, but there is no form on this page. It looks another page submits to this page, you will need to use either the any form post or before page loads triggers.
2) Are you sure "localhost" is the correct way to refer to the smtp server? double check with the host for the correct smtp server name.
3) usually Pear Mail for SMTP is used when the SMTP server requires authentication, but you have not added a user name and password.