It seems AAPL are now using MSFT mail services to deliver "Important" messages.
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Subject: Important Message From Apple Store
To: Recipients <sam@louisville.edu>
From: Apple <sam@louisville.edu>
Date: Tue, 7 May 2013 20:18:35 +0100
Reply-To: <sam@louisville.edu>
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Of course I didn't follow any of the links in the email 😄