Hi Erin, yes there is. It's a support ticket system, not an email address, but there's a team dedicated to answering support questions. Open up a ticket at support.atlassian.com.
Also in general here's the HipChat home page for support:
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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