Bueno, a ver, adaptá esto a tus datos:
Código PHP:
session_start();
$carro=$_SESSION['carro'];
$html="<table width='630' border='0' cellspacing='0' cellpadding='0' align='left'>
<tr bgcolor='#333333' class='titabla'>
<td width='169'>Código</td>
<td width='322'>Descripción</td>
<td colspan='2' align='center'>Cantidad de Unidades</td>
</tr>";
$color=array("#ffffff","#F0F0F0");
$contador=0;
foreach($carro as $k => $v){
$contador++;
$html.="<tr bgcolor='".$color[$contador%2]."' class='conttabla'>
<td>".$v['codigo']."</td><td>".$v['descripcion']."</td>
<td width='139' align='center' colspan='2'>".$v['cantidad']."</td>
</tr>";}
$html.="</table>";
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset= iso-8859-1\r\n";
$headers .= "Reply-To: [email protected]\r\n";
$headers .= "From: XXX<[email protected]>\r\n";
mail($_POST["email"],"Consulta",$html,$headers);