Small problem with form fields while sending e-mail to submit comments

I have used a simple coment form for a website.
Everything is working fine, except that if a field contains \ in the input, the mail I recieve shows up \\ instead of one backslash.
this is the part of the code

<?php
$title=$_POST['title'];
$name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$organization=$_POST['organization'];
$mailingaddress=$_POST['mailingaddress'];
$mailingaddress2=$_POST['mailingaddress2'];
$city=$_POST['city'];
$state=$_POST['state'];
$zip=$_POST['zip'];
$phone=$_POST['phone'];
$email_address=$_POST['email_address'];
$email_address2=$_POST['verify_email_address'];
$comments=$_POST['comments'];
$to="soniya@huestechnologies.com";
$header .= "MIME-Version: 1.0rn";
$header .= "Content-Type: text/html; charset=iso-8859-1rn";
$from="$email_address";
$message="$title $name $last_name\n$organization\n$mailingaddress\n$mailingaddress2\n$city $state $zip\n$phone\n$email_address\n$email_address2\n\n$comments\n";
if(mail($to,"Comments From NIA MPU",$message,"From: $email_address\n")) {
echo "Thanks for your comments.";
} else {
echo "There was a problem sending the mail. Please check that you filled in the form correctly.";
}
?>

The form is working perfectly fine except this small problem, which the client has pointed out.
This problem is there ONLY if the user enters a backslash in any of the fields. The e-mail I get contains two backslash instead of one.
 Entering forward slash "/" does not change it at all.
Please help.