php script does not submit to my email

am having html form with name , email and message and i want when someone fills in the details and press submit, the info goes to my email. But when i tried it i got an error

Warning: mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\xampp\htdocs\forms\script.php on line 18

here is my html doc

Enter Name:

Enter Email Address:

Enter Message:

the php file