From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Mon Dec 10 2007 - 14:29:42 CST

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On Mon, Dec 10, 2007 at 02:06:31PM -0500, Greg Cowie wrote:

> Thanks very much Victor - by dividing the incoming and outgoing into two
> transport streams and applying the smtp_generic_maps to JUST the
> outgoing stream, I get around the issue of not wanting to rewrite
> recipient fields, as those by definition will be in the incoming stream.
>

In headers there is no real difference between recipients and senders,
as "Reply" reverses the roles. The important mental rule is that any
single email reader should see a consistent and stable view of the
addresses in headers, and be able to use the addresses to reply.

So destination-dependent rewriting makes more sense than context-dependent
(context == From, To or Cc) rewriting.

If you can separate inside and outside recipients by transport you are
doing as well as-is reasonably possible.

--
        Viktor.

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