getting sendmail to add Return-Path: header

[Matthew Seaman]

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.
> 
> 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= flags (which is the default for the local and prog mailers)
will insert the Return-Path: header -- eg.

    Mlocal,         P=/usr/libexec/mail.local, F=lsDFMAw5:/|@qPSXfmnz9, S=EnvFromSMTP/HdrFromL, R=EnvToL/HdrToL,
                                                             ^^^^
                    T=DNS/RFC822/SMTP,
                    A=mail.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

-- 
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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