Hi,
I'm trying to add a PHP form I found on the Internet, but when I press send this error appears:

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\Abyss Web Server\htdocs\sendemail.php on line 49

contact.php:

<form method="post" action="sendemail.php">

<?php
$ipi = getenv("REMOTE_ADDR");
$httprefi = getenv ("HTTP_REFERER");
$httpagenti = getenv ("HTTP_USER_AGENT");
?>

<label for="visitor">Name</label>
<input type="text" id="visitor" name="visitor" /><br />
<label for="visitoremail">Email:</label>
<input type="text" id="visitoremail" name="visitoremail" /><br />
<label for="attn">Type of enquiry:</label>
<select id="attn" name="attn" size="1">
 <option value="General">General Questions</option>
 <option value="ProductInquiry">Product Inquiries</option>
 <option value="ServiceInquiries">Service Inquiries</option>
 <option value="SiteComments">Website Comments</option>
</select><br />
<label for="notes">Enquiry:</label>
<textarea id="notes" name="notes" rows="4" cols="40"></textarea>
<br />
<input class="submit" type="submit" value="Send" /><br />

<input type="hidden" name="ip" value="<?php echo $ipi ?>" />
<input type="hidden" name="httpref" value="<?php echo $httprefi ?>" />
<input type="hidden" name="httpagent" value="<?php echo $httpagenti ?>" />

</form>

sendemail.php:

<?php
if(!$visitormail == "" && (!strstr($visitormail,"@") || !strstr($visitormail,".")))
{
echo "<h2>Please enter a valid email address</h2>\n";
$badinput = "<h2>Feedback was NOT submitted</h2>\n";
echo $badinput;
}
if(empty($visitor) || empty($visitormail) || empty($notes )) {
echo "<h2>Please fill in all the fields</h2>\n";
}

$todayis = date("l, F j, Y, g:i a") ;

$attn = $attn ;
$subject = $attn;

$notes = stripcslashes($notes);

$message = " $todayis [EST] \n
Attention: $attn \n
Message: $notes \n
From: $visitor ($visitormail)\n
Additional Info : IP = $ip \n
Browser Info: $httpagent \n
Referral : $httpref \n
";

$from = "From: $visitormail\r\n";

mail("sample@email.com", $subject, $message, $from);

?>

<p align="center">
Date: <?php echo $todayis ?>
<br />
Thank you, <?php echo $visitor ?> (<?php echo $visitormail ?>).
<br />

Attention: <?php echo $attn ?>
<br />
Message:<br />
<?php $notesout = str_replace("\r", "<br/>", $notes);
echo $notesout; ?>
<br />
<?php echo $ip ?>

<br /><br />
<a href="contact.php">Back</a>
</p>

If you can help it would be greatly appreciated.
~wickford