PHP mail won't send when there is a url a tag in the body

PHP mail won't send when there is a url a tag in the body

$erm.= '<TR>
<TD WIDTH="50%">'."Download-".$j.'</TD>
<TD WIDTH="50%"><a
href="http://xyz.com'.$path.'">Download</a></TD>
</TR>';
<?php
$from_id="support@xyz.com";
$header = "From: HCS Support Team <$from_id>\r\n" . "Reply-To:
$from_id\r\n";
$header .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$header .= 'MIME-Version: 1.0' . "\r\n";`enter code here`
$header .= 'X-Mailer: PHP/' . phpversion(). "\r\n";
$subject = "Request for Case Study Solution Received";
@mail("ali.dzinemedia@gmail.com",$subject ,$erm,$header);
?>
please solved this . when i added Download in the mail body mail not send.
if i remove this a tag mail sent and all other content display as per my
requirement .
I dont know where is the exact problem, i m using godady hosting with PHP
5.3 version.
if any one have better solutions please share with me .