Hi, Sorry to post to such an old thread we running 14,2 and are experiencing the same type issue (it's unclear if its from a specific address)  . I have checked the mailbox  in question and no content filer rules have been set-up.  I have checked the headers of the email in question and they look OK e.g, X-SmarterMail-TotalSpamWeight=0;

 

I did send e test email from my account and it was delivered to the users inbox OK.

 

The user is running I.E on Windows 7. I am asking them to confirm the version.

Thanks in advance.