Look this code:
$to="$email";
$sub="Hi";
$mex="hi <br /> \"<a href='http://exemple.com/ver.php?id=$cod'</a>"\";
$int = "From:h@h.com";
$int .= "Reply-To:try@try.com";
$int .= "X-Mailer: PHP/".phpversion();
mail($to, $sub, $mex, $int);
The error is on $mex, I think it's on "<a href.."
How to fix this?