<?php

// Find the code you see below... (starting at line 18)
$mail_headers = 'From: online-order@rivergretawriter.co.uk';
$mail_headers = 'Reply-To: noreply@rivergretawriter.co.uk';

// Change it to this:
$mail_headers = 'From: online-order@rivergretawriter.co.uk' . "\r\n";
$mail_headers .= 'Reply-To: noreply@rivergretawriter.co.uk' . "\r\n";

?>