Form Mail Issue

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How can I make it so this connects to the server I want the message to be sent to...? The errors are as follows:

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:\Sites\Single25\litohin\webroot\contact.php on line 74

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:\Sites\Single25\litohin\webroot\contact.php on line 78

For some reason it cannot connect to the mailserver, can someone help me fix this?

<?php

$valid_ref1="http://www.northamericanweather.com/contact.html";
$valid_ref2="http://www.northamericanweather.com/contact.html";
$replyemail="[e-mail]";

function clean_input_4email($value, $check_all_patterns = true)
{
$patterns[0] = '/content-type:/';
$patterns[1] = '/to:/';
$patterns[2] = '/cc:/';
$patterns[3] = '/bcc:/';
if ($check_all_patterns)
{
$patterns[4] = '/\r/';
$patterns[5] = '/\n/';
$patterns[6] = '/%0a/';
$patterns[7] = '/%0d/';
}
return preg_replace($patterns, "", strtolower($value));
}

$name = clean_input_4email($POST["name"]);
$email = clean_input_4email($POST["email"]);
$thesubject = clean_input_4email($POST["thesubject"]);
$themessage = clean_input_4email($POST["themessage"], false);

$error_msg='ERROR - not sent. Try again.';

$success_sent_msg='<p align="center"><strong>&nbsp;</strong></p>
<p align="center"><strong>Your message has been successfully sent to us<br>
</strong> and we will reply as soon as possible.</p>
<p align="center">A copy of your query has been sent to you.</p>
<p align="center">Thank you for contacting us.</p>';

$replymessage = "Hi $name

Thank you for your email.

We will endeavour to reply to you shortly.

Please DO NOT reply to this email.

Below is a copy of the message you submitted:

Subject: $thesubject
Query:

$themessage

Thank you";

if (!isset($_POST['email']))
{
echo "<script language=\"JavaScript\"><!--\n ";
echo "top.location.href = \"$valid_ref1\"; \n// --></script>";
exit;
}

$ref_page=$_SERVER["HTTP_REFERER"];
$valid_referrer=0;
if($ref_page==$valid_ref1) $valid_referrer=1;
elseif($ref_page==$valid_ref2) $valid_referrer=1;
if(!$valid_referrer)
{
echo "<script language=\"JavaScript\"><!--\n alert(\"$error_msg\");\n";
echo "top.location.href = \"$valid_ref1\"; \n// --></script>";
exit;
}
$themessage = "name: $name \nQuery: $themessage";
mail("$replyemail",
"$thesubject",
"$themessage",
"From: $email\nReply-To: $email");
mail("$email",
"Receipt: $thesubject",
"$replymessage",
"From: $replyemail\nReply-To: $replyemail");
echo $success_sent_msg;
?>