According to publicly available computer records, the IP [Internet Protocol] address for the mail.presidentclinton.com server is 18.104.22.168 from at least 2009 to 2011. Records also show that mail.clintonemail.com server has the same exact IP address, 22.214.171.124, from at least May 21, 2010 to October 21, 2010. That means the two servers must have been in the same location for that overlapping time period.
Computer records can also indicate where the IP addresses are physically located, and that IP address at that time is somewhere in the middle of Manhattan, New York City. That makes sense for presidentclinton.com, since former President Bill Clinton’s offices are there, and the Clinton Foundation headquarters is also there. But that would suggest that Hillary Clinton’s clintonemail.com server used for all her secretary of state work is also based in Manhattan and not Chappaqua, New York, for at least part of 2010. (DNS History, 9/7/2015) (DNS History, 9/7/2015) (IP Tracker, 9/3/2015)