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 D:\AppServ\www\orders\processfeedback.php on line 17

PHP的mail函数只是负责把信件交到你的邮局，如果你指定的IP地址（相当于某个门牌号码）不提供邮局服务，信件就会发不出去。