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Date: Wed, 12 Feb 1997 12:02:58 -0600 (CST)
From: Dave Bodenstab <imdave@synet.net>
Message-Id: <199702121802.MAA04289@base486.synet.net>
To: questions@freebsd.org
Subject: email ``reply-to'' question
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A friend has a problem replying to my email -- he's the only
one who has mentioned this to me, but perhaps others have
the same problem.  I've looked at the man pages for mail(1),
sendmail(8) and mailaddr(7), but this topic did not seem to
be addressed.

I have a dial-up PPP account with dynamic address assignment.
My ISP is ``synet.net''.  I've got:

  # who I masquerade as (null for no masquerading) (see also $=M)
  DMsynet.net

in sendmail.cf, so (I thought) that my outgoing email would identify
the origin of the email as ``imdave@synet.net''.  Indeed, when I send
mail to my account at my ISP (imdave@syenet.net) and then retrieve it,
the headers look like:

  From fetchmail Tue Feb 11 10:59:39 1997
  Received: from base486.synet.net (imdave@DIAL7.SYNET.NET [168.113.1.9]) by g30.synet.net (8.8.3/8.8.3) with ESMTP id KAA11994 for <imdave@synet.net>; Tue, 11 Feb 1997 10:50:11 -0600
  Received: (from imdave@localhost)
  	by base486.synet.net (8.8.5/8.8.5) id KAA03154
  	for imdave@synet.net; Tue, 11 Feb 1997 10:57:46 -0600 (CST)
  Date: Tue, 11 Feb 1997 10:57:46 -0600 (CST)
  From: Dave Bodenstab <imdave@synet.net>
  Message-Id: <199702111657.KAA03154@base486.synet.net>
  To: imdave@synet.net
  Subject: test header

The ``From:'' line uses the masquerade, but the ``Received: from''
line does not.  There is no ``Reply-to:'' line.  My friends mailer
seems to be constructing a return address from the ``Received: from''
lines, and the result is ``imdave@base486.synet.net'' which of course
fails.  In summary:

1. Are my email headers being constructed properly, and if not,
   how do I fix it?  If I need to add a ``Reply-to:'' line, how
   do I make /usr/bin/mail do it?  I didn't see an option for
   sendmail that addressed this.
2. I don't know what mailer my friend uses; could his mailer be
   doing the wrong thing?
3. Is there any standard that dictates how a return address
   should be extracted from the email headers?

Dave Bodenstab 
imdave@synet.net