[Mimedefang] Mimedefang stream-by-recipient and Mailman

[Rich West]

We have a server that has Mailman running on it for close to 80 lists, 
and, on that same server, we have our 
sendmail+mimedefang+File::Scan+Anomy mail server.  Mailman sends its 
mail out locally to the sendmail server (not utilizing VERP as that 
caused us a world of other problems in the past), and mimedefang seems 
to be analyzing the messages as they go out (not what was originally 
intended).

Quite suddenly, emails FROM the mailman server were not going out.  
After a frazzling hour, it was discovered that a section of code in the 
mimedefang filter was causing the problem, although the piece of code 
was in place for well over a month.  Commenting it out and restarting 
mimedefang allowed the mailman mail to be sent out.

The code was:
  if (stream_by_recipient())
  {
     return;
  }
Sendmail was logging the following when a message was sent to our test list:
Apr 26 15:00:27 ourserver sendmail[11884]: j3QJ0FmI011884: 
from=<[EMAIL PROTECTED]>, size=1964, class=-30, nrcpts=5, 
msgid=<[EMAIL PROTECTED]>, proto=ESMTP, 
daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Apr 26 15:00:29 ourserver mimedefang.pl[11378]: j3QJ0FmJ011884: streamed 
by domain or recipient and resent.
Apr 26 15:00:29 ourserver mimedefang[11362]: j3QJ0FmJ011884: Discarding 
because filter instructed us to
Apr 26 15:00:29 ourserver sendmail[11884]: j3QJ0FmJ011884: Milter: data, 
discard
Apr 26 15:00:29 ourserver sendmail[11884]: j3QJ0FmJ011884: discarded

Now, we've disabled stream_by_recipient, but it's global.  We would 
prefer to keep the stream_by_recipient() call in there (the server can 
handle it) for other purposes.  What would be the best way, in 
filter_begin(), to utilize stream_by_recipient() for messages only 
coming from external hosts (in other words, to utilize 
stream_by_recipient() on all emails EXCEPT localhost)?

Thanks!
-Rich
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