Not sure how much you need its only that one line giving problems but heres more...
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
// Create email headers
$headers .= 'From: '.$from."\r\n".
'Reply-To: '.$from."\r\n" .
'X-Mailer: PHP/' . phpversion();
// HTML email message
$message = '<html><body>';
$message .= '<table role="presentation" width="640" style="width:640px;" cellpadding="0" cellspacing="0" border="0" align="center"><tr><td align="center" bgcolor="#EEEEEE" background="https://safebuy.nz/images/background.png" valign="top" style="background: url("https://safebuy.nz/images/background.png") center / cover repeat #EEEEEE;">';
$message .= '<p>Seller has sent the goods for Safebuy reference sid'.$_POST["sid_trans"].'</p>';
$message .= '<p>Description of goods: '.$idesc.'</p>';
$message .= '<p>'.$track.'</p>';
$message .= '<p>Let us know when goods have arrived at <a href="http://safebuy.nz/posted/buyers-evaluation.php?sid_trans='.$_POST["sid_trans"].'">http://safebuy.nz/posted/buyers-evaluation.php?sid_trans='.$_POST["sid_trans"].'</a> .</p>';
$message .= '</td></tr></table></body></html>
