It's because it used to be sent via Upakul's account (upacool@gmail or something like that), but now it's via a mailer daemon:
Received: from ssd13.stablehost.com (cp32.stablehost.com. [199.96.156.83])
by mx.google.com with ESMTPS id b4si1529397pbl.130.2014.04.02.09.08.56
Apparently, Gmail is unable to resolve this sender automatically, so you can just add it to your contacts list and assign a name manually.