Benni

Error:
MailScanner: Attempt to hide real filename extension (document.xml.rel)
This is becuase M$ Office 2007 documents (.docx, .xlsx etc, etc.) seem to be archived XML documents and MailScanner does not like that.
The solution is to put this in filename.rules.conf
allow   \.xml\.rel$             -       -
allow   \.rel$                  -       -
allow   \.docx$                 -       -
allow   \.xlsx$                 -       -
allow   \.xml\d*\.rel$          -       -
allow   \.x\d+\.rel$            -       -
allow   [...]