Addressing a Cover Letter

<p>So, I know that it is important to try to find the name of the proper person to address a cover letter to. The internship description that I'm looking at does not have any indication of who to address the letter to, or even what department in the large business is responsible for the interns. Would it be appropriate for me to send an email to the general "contact us" email address on their website asking who I should address to letter to? Would this be annoying, or show due diligence? Thanks for any help!</p>