[Mimedefang] Restrictions on the use of stream_by_recipient()

[Robert J. Clark]

Hi,

I want to start customizing the spam and virus filtering behaviour for
each individual recipient and to do that I have to use
stream_by_recipient(). However, after reading the docs and scanning
the source code, I have a couple of questions and would appreciate any
thoughts or ideas people have on the following:

- The docs say that stream_by_recipient() must be called at the very
  beginning of filter_begin(). I have some checks that could
  potentially cause the email to be rejected and I would like to to
  that before stream_by_recipient() so that no bounce message is
  created.

  Can I do these checks and bounce the message (call
  action_tempfail() or action_discard() and return) before I call
  stream_by_recipient()?

  Is there anything I need to watch out for when I do this?

- Secondly, I would like to preserve the IP address of the connecting
  host even through a call to stream_by_recipient(). I noticed that
  there is support for doing the when going from a secondary MX to a
  primary, but I did not think that headers could be modified before a  
  call to stream_by_recipient(). Is this correct and is there any
  other way to do what I want?

Thanks for any suggestions or info.

- Rob