The following code will look like a normal link to customers, but will protect your email address:
<script type=text/javascript>
var _u = "sales";
var _d = "domain.co.uk";
var _l = _u + "@" + _d;
var _m = "click to email us";
document.write("<a href='mailto:"+_l+"'>"+_m+"</a>");
</script>
Change the 'sales' and 'domain.co.uk' to your own email address.