failED to connect SMTP

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PHP

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:\wamp\www\Login\insert.php on line 101

I am using the following code!!

$sendto = $_POST['email']; // this is the email address collected form the form
$ccto = "you@yourdomain.com"; //you can cc it to yourself
$subject = "email confirmation"; // Subject
$message = "the body of the email - this email is to confirm etc..."
$header = "From: auto-confirm@yourdomain.com\r\n";
$header .= "Reply-to: you@yourdomain.com\r\n";
// This is the function to send the email
mail($sendto, $subject, $message, $header);      // line no... 101

Please Help!!