Administrator receiving messages that are not addressed to them

I am the company's Exchange Online (Office 365) administrator. The system was converted from Exchange 2007 (SBS 2008) using Quest as an intermediary. The question is I'm receiving messages from other users that did not put my email address in the To/CC/BCC field. I verified by looking at one of the messages from their sent box. Each time the message is delivered to my Outlook Junk Email folder. From the ones I currently have the sender was replying to another message. The messages did get delivered to the intended recipient, but I got a copy as well. No attachments. I'm concerned because the majority of the messages are to family and I don't want to know the employees' personal business. Where should I begin to look for the mis-configuration?
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GISCOOBYDirector of Information TechnologyAsked:
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Jeff LeggIT ManagerCommented:
Have you checked in the Admin Center for any rules in under "mail flow" by any chance?
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Vasil Michev (MVP)Commented:
You have some form of forwarding configured, either regular forwarding, Inbox rules or Transport rules. Best thing to do is run a Message trace, it will give you an idea how the message ended up in your mailbox: https://technet.microsoft.com/en-us/library/jj200712(v=exchg.150).aspx
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GISCOOBYDirector of Information TechnologyAuthor Commented:
Jeff,
The only rule I have turned on is for a range of IP addresses I add an SCL value to the header.
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GISCOOBYDirector of Information TechnologyAuthor Commented:
Vasil,
I have created the trace, but it is taking some time to complete.
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GISCOOBYDirector of Information TechnologyAuthor Commented:
Vasil,
Based on the trace, the problem came back and was because of the outbound SPAM filter was set to send potential outbound spam to my email address. I read this was a best practice to ensure your domain wasn't compromised, but clearly it grabs more than intended. What are you recommendations?
Capture of current Outbound SPAM configuration screen.
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Vasil Michev (MVP)Commented:
Well did you check the spam score for those messages? I havent seen any issues where non-spam messages were sent/forwarded to the designated recipient because of this functionality. Which doesnt rule out the possibility that something broke service-side, but still.

You mentioned you have a transport rule setting SCL above, perhaps it is interfering and overridding the detected messages spam score, thus making them look "normal", while in fact they were detected as outbound spam in the first place?
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