I tried sending an email to that domain to see if it would bounce back, but it didn't. I was hoping to get the server's IP address.

Looks like bouncebacks were working yesterday, but have been disabled: http://www.zerohedge.com/news/2015-03-03/hdr22clintonemailco...

Edit:

I tried to telnet to the server:

   telnet clintonemail.com 25
   Trying 208.91.197.27...
   telnet: Unable to connect to remote host: Connection timed out

Where is that IP address? British Virgin Islands: http://www.ip-address.org/lookup/ip-locator.php?track=208.91...