Roderick A. Anderson a écrit : > 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. > >
you need to read about how SMTP works. it goes like this: EHLO joe.example.com ... MAIL FROM:<sen...@example.com> ... RCPT TO:<virgi...@example.net> ... DATA ... header_1: value_1 header_2: value_2 ... body blah blah . QUIT so the message (including the headers) is passed after the DATA command. the envelope sender is passed in the MAIL FROM: command. it may end up ina Return-Path header, but as already said, this is config-dependent.
