[Exim] System filter and error bounces

As you'll no doubt all be aware, the exim system filter doesn't run
on error bounces (i.e. those with envelope froms of <> ):

   # drop out error messages here
   if error_message
   then
     finish
   endif

However, we've recently received unsolicited mail with .EXE
attachments which are forged to look like error bounces. Is there
a good reason for having to let these slip through the filter?



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I always wanted to be someone - I guess I should have been more specific