[Mimedefang] Is Virus Checking in Procedure Filter Doable?

[Johnson, Robert F]

I would like to rework mimedefang-filter to enable normal bad file type
filtering to occur before virus scanning.  I've tried just moving the
code around but with know success.

Can mimedefang-filter be modified to run virus scanning in filter
instead of filter-begin?  I have tried just moving the code to Filter
but it doesn't work.  Are there any samples for this type of
implementation?

Conversely can the bad_filetype filtering (including zip file scanning)
be run in Filter-Begin instead if Filter? 

Are there any exampled around if either of the above variations?

Thanks for any help!

Robert