On Nov 5, 2009, at 3:02 PM, "Roderick A. Anderson" <raand...@cyber-office.net > wrote:

Roderick A. Anderson wrote:
Roderick A. Anderson wrote:
My understanding, from following several threads here and some research, is the return-path is transmitted out-of-band in the SMTP MAIL request and placed in the message by the LDA.

How would a proxy determine the value(s) that will be used to create the Return-Path?
Sahil, Victor;
Thank you for your quick responses. You explanations make my understanding more concise. A little more reading about AMIL FROM on the Postfix site and I think I'm on my way towards building the proxy I need.

Besides the typo above (MAIL FROM) I forgot to ask is there an example of how a message is formatted on it's way into the proxy?

I only need to look at the MAIL FROM, the message Subject header, and possibly another message header. Content isn't needed.

Postfix submits the message to the proxy via ESMTP. See SMTPD_PROXY_README.

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