On Tue, Aug 05, 2014 at 04:56:57PM +0000, Xie, Wei wrote:
> Sorry to reply to you lately due to some reasons.
Your reply is HTML-formatted, and takes too much work to de-HTML.
So I can't reply in detail.
> The logic of our requirement or idea is described as the following
> syntax in terms of header_check in Postfix: To any forwarding emails
> from non-osu.edu and non-ohio-state.edu sender addresses, we need
> fetch "original to address" and add one line "Resent-From: <original
> to address>" via Postfix.
As explained before, overloading Resent-From: in this way is a bad
idea. Secondly header-checks cannot do this for multiple reasons.
The most fundamental is that the original recipient that is forwarded
often does not appear in any headers and so cannot be extracted
from header content.
A delivery agent processing one recipient at a time, (e.g. local(8))
can insert recipient-specific headers, and in fact local(8) typically
inserts "Delivered-To:". You'd naturally have to delay recipient
rewriting so that the delivery agent sees the original address and
performs the rewriting itself. It may be possible to do something
with "ORCPT" and an SMTP delivery agent delivering to a custom
SMTP talker.
Mostly, it is still unclear why what you say you want, even with
some header other than "Resent-From:" is plausibly a good idea.
I'm afraid that's all the help I can give.
--
Viktor.
