An email keeps going to junk folder in outlook 2013

I have one Outlook 2013 user that has emails from one sender repeatedly going to his junk mail folder. I have added that email to safe senders, disabled junk email in outlook 2013 via registry (it's is actually greyed out), disabled junk email via group policy, disabled anti-spam scm on that user's mailbox and still the emails from one sender end up in the junk email folder. I am running out of ideas. Does anyone have any other suggestion?
jsgrosskopfIS ManagerAsked:
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jsgrosskopfConnect With a Mentor IS ManagerAuthor Commented:
After contacting Microsoft, it appears there is some flaw in Outlook 2013 and Exchange 2013 where there are junk mail rules hidden. This was the case here. I had to download MFCMapi from codeplex and followed their instructions....all fixed
Neil RussellTechnical Development LeadCommented:
Have you checked for a rule in outlook?
jsgrosskopfIS ManagerAuthor Commented:
Yep, did that today. Forgot to include that in my question
Mark GalvinManaging Director / Principal ConsultantCommented:
Is there anything in the header information that indicates why Outlook is placing the email into the Junk Email Folder?

Whats the Exchange backend here?

IS there any Anti-Spam AV software running on the local PC?

jsgrosskopfIS ManagerAuthor Commented:
I'll have to look at the header info to find 2013 and I disabled all the anti-spam that was (outlook) on the PC
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