Noted sir, I will use this e-mail format for new staff. But if you need to change and existing e-mail same as your recommended, we can’t do it. Because the e-mail system will not be able to change e-mail name.
Change the e-mail name is to delete and then new create, so therefore affect the old e-mail will disappear. I suggest to change only who had just new e-mail , such as Mr.Dachar, or a particular person, you see fit to change. I’ll to export current e-mail, after create new e-mail already I will to import into outlook that user’s machine. But that old e-mail will not stores in server.