replace skeleton site

Hello there I have many customers that use the hosting account for only email. So our skeleton page is stil showing on their domain. Now i have updated the skeleton page, and i want to push this new page to all the clients where the old skeleton page is still being used. Is there some way to do this ? Perhaps and MD5 search on the file, server wide or something like that to make sure its exactly the same old skeleton page. or is there some other smart way