dovecot - Jun 2011 - Explain about (mail_get_first_header(mail, "From", &header)

Hi Timo...

Inside my plugin, i use the (mail_get_first_header(mail, "From",
&header) function, to get the email From to put in some Blacklist.

Looking in the header under this mail, we have 2 "From" fields.

Using the function above, i get the Second "From", but my MTA (exim)
look in to The First From, in the First Line, in that way, my
blacklist don't work, because the sender to be blocked is different
from

the From looked by dovecot.

There is a way to get the "From" from First line ?



############################## HEADER
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>From dma_3783 at envios.socomdescontos.com.br Tue Jun 07 15:43:04 2011
Return-path: <dma_3783 at envios.socomdescontos.com.br>
Envelope-to: sugestao at brc.com.br
Delivery-date: Tue, 07 Jun 2011 15:43:04 -0300
Received: from [187.61.43.119] (helo=vt-0007-119.virtualtarget.com.br)
	by mail.brc.com.br with esmtp (Exim 4.76)
	(envelope-from <dma_3783 at envios.socomdescontos.com.br>)
	id 1QU1Ex-0006II-5o
	for sugestao at brc.com.br; Tue, 07 Jun 2011 15:43:01 -0300
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<sugestao at brc.com.br>; Tue, 7 Jun 2011 15:42:59 -0300 (envelope-from
<dma_3783 at envios.socomdescontos.com.br>)
From: "CompraFacil.com.br" <mkt at socomdescontos.com.br>
To: "sugestao" <sugestao at brc.com.br>
Subject: SUPER OFERTA: TV LCD 32? Full HD apenas 10x 129,99 reais com
FRETE ZERO. Aproveite.
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Message-ID: <0.0.1E.8DF.1CC2542B91E3284.8E34 at
vt-0007-119.virtualtarget.com.br>
Date: Tue, 7 Jun 2011 15:42:59 -0300


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On Fri, 2011-06-10 at 09:19 -0300, Alex Baule wrote:
> Hi Timo...
> 
> Inside my plugin, i use the (mail_get_first_header(mail, "From",
> &header) function, to get the email From to put in some Blacklist.
> 
> Looking in the header under this mail, we have 2 "From" fields.
Do you mean these?
>From dma_3783 at envios.socomdescontos.com.br Tue Jun 07 15:43:04 2011
From: "CompraFacil.com.br" <mkt at socomdescontos.com.br>
> Using the function above, i get the Second "From", but my MTA
(exim)
> look in to The First From, in the First Line, in that way, my
> blacklist don't work, because the sender to be blocked is different
> from
> 
> the From looked by dovecot.
> 
> There is a way to get the "From" from First line ?
The first line isn't a From: header. It's the "envelope
sender". That
line typically exists only with mbox format, not with other mailbox
formats.. If you deliver a mail via dovecot-lda it removes this From
line if it sees it.

Typically you'd get this info from Return-Path: header.