OC won't confirm order

[irwin]

Hi, when I make a 'test' purchase, as soon as I click on 'Confirm Order' I get this error message

 

Warning: mail() [function.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:\Program Files\xampp\htdocs\catalog\includes\classes\email.php on line 522

 

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\catalog\includes\classes\email.php:522) in C:\Program Files\xampp\htdocs\catalog\includes\functions\general.php on line 33

 

I'm still new to osCommerce. Hope someone can help. Thanks.