Contact form stopped working...!?

It was working fine lastnight and tested it today and no email coming through... Can anyone see anything wrong with the following code?

<?php
/***************************************************\
 * PHP 4.1.0+
 
\***************************************************/



$to = "email_removed@hotmail.com";
$MailSubject="Booking Request";
$firstName=$_POST["firstname"];
$lastName=$_POST["lastname"];
$address= $_POST["address"];
$email=$_POST["email"];
$from=$_POST["email"];
$town=$_POST["town"];
$country=$_POST["country"];
$postcode=$_POST["postcode"];
$location= $_POST["location"];
$tel=$_POST["telephone"];
$typeoffunction=$_POST["typeoffunction"];
$date=$_POST["date"];
$noofguests=$_POST["noofguests"];
$timescale=$_POST["timescale"];
$requirements=$_POST["requirements"];
$howdidyouhearofus=$_POST["howdidyouhearofus"];


$MessageText = "Booking Request\n\n$firstName $lastName has just submitted their information, here are the details which were entered:
\nFirst name: $firstName
\nLast name: $lastName
\nAddress: $address
\nTown: $town
\nCountry: $country
\nPostcode: $postcode
\nTelephone: $tel
\nE-mail: $email";
\n
\nVenue/Location : $location
\nType of function: $typeoffunction
\nRequirements: $requirements 
\nDate : $date
\nNumber of guests: $noofguests 
\nTimescale: $timescale 
\n
\nHow did you hear of us: $howdidyouhearofus 

mail("$to", "$MailSubject", "$MessageText", "From: $from <$from>\r\nReply-To: $from <$from>\r\n" );

?>

PHP:

 

Just noticed the mistake, made the changes and thought I fixed it but still doesnt seem to work

<?php
/***************************************************\
 * PHP 4.1.0+
 
\***************************************************/



$to = "email_removed@hotmail.com";
$MailSubject="Booking Request";
$firstName=$_POST["firstname"];
$lastName=$_POST["lastname"];
$address= $_POST["address"];
$email=$_POST["email"];
$from=$_POST["email"];
$town=$_POST["town"];
$country=$_POST["country"];
$postcode=$_POST["postcode"];
$location= $_POST["location"];
$tel=$_POST["telephone"];
$typeoffunction=$_POST["typeoffunction"];
$date=$_POST["date"];
$noofguests=$_POST["noofguests"];
$timescale=$_POST["timescale"];
$requirements=$_POST["requirements"];
$howdidyouhearofus=$_POST["howdidyouhearofus"];


$MessageText = "Booking Request\n\n$firstName $lastName has just submitted their information, here are the details which were entered:
\nFirst name: $firstName
\nLast name: $lastName
\nAddress: $address
\nTown: $town
\nCountry: $country
\nPostcode: $postcode
\nTelephone: $tel
\nE-mail: $email
\n
\nVenue/Location : $location
\nType of function: $typeoffunction
\nRequirements: $requirements 
\nDate : $date
\nNumber of guests: $noofguests 
\nTimescale: $timescale 
\n
\nHow did you hear of us: $howdidyouhearofus";

mail("$to", "$MailSubject", "$MessageText", "From: $from <$from>\r\nReply-To: $from <$from>\r\n" );

?>

PHP:

 

Add or die("Mail Error");

See if its the mail funtion playing up.

 

Your form is badly vulnerable to abuse by spammers.