-if(stristr($emailaddress, 'mailto:')) {
- $emailaddress = substr($emailaddress, 7);
+$mailto_pos = strpos(strtolower($emailaddress), 'mailto:');
+if($mailto_pos !== false) {
+ $emailaddress = substr($emailaddress, $mailto_pos+7);
+ $_GET['emailaddress'] = $emailaddress;