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Date:      Fri, 4 Jul 2003 20:04:58 +0100
From:      Matthew Seaman <m.seaman@infracaninophile.co.uk>
To:        David Banning <david@skytracker.ca>
Cc:        questions@freebsd.org
Subject:   Re: getting sendmail to add Return-Path: header
Message-ID:  <20030704190458.GD69059@happy-idiot-talk.infracaninophile.co.uk>
In-Reply-To: <20030704151957.GA14457@skytrackercanada.com>
References:  <20030704151957.GA14457@skytrackercanada.com>

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On Fri, Jul 04, 2003 at 11:19:57AM -0400, David Banning wrote:
> I need to have the Return-Path: header to added to my emails.
>=20
> Any idea what is needed to configure sendmail to do that?

Return-Path: is meant to be inserted into the message headers by the
sendmail that does final delivery -- it's not something you should set
on all of the e-mail you send out.  The machinery to handle all this
should already be in your sendmail.cf -- if there's a line:

    H?P?Return-Path: <$g>

in the 'Format of Headers' section, then any delivery mailer with 'P'
in the F=3D flags (which is the default for the local and prog mailers)
will insert the Return-Path: header -- eg.

    Mlocal,         P=3D/usr/libexec/mail.local, F=3DlsDFMAw5:/|@qPSXfmnz9,=
 S=3DEnvFromSMTP/HdrFromL, R=3DEnvToL/HdrToL,
                                                             ^^^^
                    T=3DDNS/RFC822/SMTP,
                    A=3Dmail.local -l

These are the default settings, and it would take sufficient effort to
generate a sendmail.cf without something like those in it that you
would surely remember doing so...

See http://www.faqs.org/rfcs/rfc2821.html, section 4.4 for the chapter
and verse about the Return-Path: header.

	Cheers,

	Matthew

--=20
Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK

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