The php developlers added a change to the php code to show where an email is sent from for security reasons. This was a good idea but it also meant that valid emails showed information this too. So if you are trying to hide your admin, which you should, this defeats that. To see this problem, place an order on your shop. Then go to admin and update the status of that order. When you receive the status update email, choose the show full headers option in your email program and notice that your admin name is listed in the line that reads X-PHP-Script.