[Mimedefang] action_defang() is a no-op? (MD 2.33)

[Mike Batchelor]

I am trying to use action_defang() in filter(), but it doesn't seem to have 
any effect.

Within filter(), I use the defang_warning() function from the example 
mimedefang-filter, and this sub has to be defined if you use 
action_defang().  I also use the filter_bad_filename() function that is 
also given in the example filter.

The code calling action_defang() goes like this:

if (filter_bad_filename($entity)) {
  return action_defang($entity, "", "", "text/plain");
}

Messages get passed through, but dangerous attachments are not converted to 
text/plain (or any other type I've tried).  I'm using MD 2.33.  Am I 
calling this function wrong?

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