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Markup + PHP

<span class="rev"><?php echo strrev($email); ?></span>

CSS

.rev{
    direction: rtl;
    unicode-bidi: bidi-override;
}

Or in a function

function safe_mailto($email) {
  echo '<span style="direction: rtl; unicode-bidi: bidi-override;">'.strrev($email).'</span>';
}

Javascript approach

function hide_email($email) {

  $character_set = '+-.0123456789@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
  $key = str_shuffle($character_set); $cipher_text = ''; $id = 'e'.rand(1,999999999);
  for ($i=0;$i<strlen($email);$i+=1) $cipher_text.= $key[strpos($character_set,$email[$i])];
  $script = 'var a="'.$key.'";var b=a.split("").sort().join("");var c="'.$cipher_text.'";var d="";';
  $script.= 'for(var e=0;e<c.length;e++)d+=b.charAt(a.indexOf(c.charAt(e)));';
  $script.= 'document.getElementById("'.$id.'").innerHTML="<a href=\\"mailto:"+d+"\\">"+d+"</a>"';
  $script = "eval(\"".str_replace(array("\\",'"'),array("\\\\",'\"'), $script)."\")"; 
  $script = '<script type="text/javascript">/*<![CDATA[*/'.$script.'/*]]>*/</script>';
  return '<span id="'.$id.'">[javascript protected email address]</span>'.$script;
  
}