du's Employee Email Address Formats

du uses 4 email formats, with first '.' last (ex. john.smith@du.ae)
being used 91% of the time.
first lastjohnsmith@du.ae1%
first '.' last_initialjohn.s@du.ae1%
first '.' lastjohn.smith@du.ae91%
other_templateother_template@du.ae7%