"Not Read" receipt received from sender for all emails sent.

We recently migrated from Exchange 2010 to Exchange 2013 and I've got one user that started having a strange problem after the migration.  She has Outlook set to request a read receipt for all emails that she sends and that works fine except that for every email she sends, she gets a "Not Read" receipt back and this not read receipt comes from her as if she sent the email to herself and didn't read it.  She also get the not read receipt if she deletes emails that are in her sent box and again, the not read receipt comes from her.  

This user is using Outlook 2007 SP3 with all available updates installed.  We've tried a new profile and we've also tried on a different computer with the same results.  She doesn't have any rules set up except for the one for clearing categories that I believe is a default rule.  I've checked the settings of the rule and there is nothing there that would be causing this.  The other strange thing is that these not read receipts seem to come in batches.  If she sends one email the the not read receipt doesn't show up or at least not immediately.  If she sends 2 or 3 messages then she'll get all of the not read receipts for those 2 or 3 messages at the same time.