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From: "Jonathan M. Bresler" <jmb>
Message-Id: <199801051630.IAA15528@hub.freebsd.org>
Subject: Re: Rewriting the "Received:" header in email
To: fbsdlist@federation.addy.com (Cliff Addy)
Date: Mon, 5 Jan 1998 08:30:45 -0800 (PST)
Cc: freebsd-questions@freebsd.org
In-Reply-To: <Pine.BSF.3.95q.980105095500.23305A-100000@federation.addy.com> from "Cliff Addy" at Jan 5, 98 10:01:23 am
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Cliff Addy wrote:
> 
> Is there a way to rewrite the Received line in email sent out by sendmail?
> For example, email received by others looks like:
> 
>   Received: from a1schip.kph.uni-mainz.de (a1schip.kph.uni-mainz.de
>   [134.93.133.63]) by federation.addy.com (8.8.5/8.6.12) with SMTP id
>   FAA07077
> 
> I'd like to rewrite the "federation.addy.com" to the virtual host sending
> the email, e.g. if account "abc" is sending the email, I want the line to
> say the email came from their domain "alphabet.com"

	<off the top of my head, you might be able to......>

	in either your .mc file or your /etc/sendmail.cf you can
	control the information that your mailhost puts in the the
	Received: line that it adds to the email message.

	so, if you have each virtual host use its own /etc/sendmail.cf
	file you can replace the "$j" in the "by $j ($v/$Z)" below
	by the hostname you want to appear.  
	for instance "by alphabet.com ($v/$Z)".
	(i dont believe that you can redefine $j on the fly,
	someone please check sendmail 2nd ed......)

	to get each virtual host to have its own /etc/sendmail.cf,
	you will have to run sendmail out fo /etc/inetd.conf
	(ouch....performance hit) or have a mail proxy accept the
	mail and relay it to the virtual host's sendmail which is
	running on a different port.

	or use ipfw's divert rule to reroute the packets to sendmail
	running on a different port.  (thank you archie cobbs ;)

	examples from hub.freebsd.org.
hub.mc
define(`confRECEIVED_HEADER', `$?sfrom $s $.$?_($?s$|from $.$_)
          $.by $j ($v/$Z)$?r with $r$. id $i$?u
          for $u; $|;
          $.$b$?g
          (envelope-from $g)$.')dnl$|;$.

/etc/sendmail.cf:
HReceived: $?sfrom $s $.$?_($?s$|from $.$_)
          $.by $j ($v/$Z)$?r with $r$. id $i$?u
          for $u; $|;
          $.$b$?g
          (envelope-from $g)$.
jmb
-- 
Jonathan M. Bresler      FreeBSD Core Team, Postmaster       jmb@FreeBSD.ORG
FreeBSD--The Power to Serve         JMB193           http://www.freebsd.org/
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