Thanks for the files line.
One of my sample tests that does work is as follows:
I can manually scan a mbox that contains a virus and it correctly
If I email that mbox in total to another user and pass it through
sanitizer/sendmail it doesnt ever check the inline attachment.
mail greg < testmbox
is the command I am running. If the filename inside testmbox in this
inline stream has an extension I can catch it. However if I another file
called testmbox2 that is identical with the exception the filename of
the attachment on the inside doesnt have an extension, it never scans it.