amexglobalbusinessTravel's Employee Email Address Formats

amexglobalbusinessTravel uses 2 email formats, with first last (ex. johnsmith@amexglobalbusinesstravel.com)
being used 50% of the time.
first lastjohnsmith@amexglobalbusinesstravel.com50%
first last_initialjohns@amexglobalbusinesstravel.com50%