Here is one way to do it using Javascript:
<script language=JavaScript type="text/javascript">
<!--
var user = "yourname";
var host = "yourdomain.com";
var link = user + "@" + host;
document.write("<a hre" + "f=mai" + "lto:" + user + "@" + host + "><b>" + link + "</b></a>");
--> </script>