Author: Murray S. Kucherawy Date: To: Ian Eiloart CC: <exim-users@exim.org>, Mike Lyon Subject: Re: [exim] How to specify Return-Path for ALL outbound e-mail that
gothrough exim?
> -----Original Message----- > From: Ian Eiloart [mailto:iane@sussex.ac.uk]
> Sent: Friday, July 01, 2011 2:57 AM
> To: Murray S. Kucherawy
> Cc: Mike Lyon; <exim-users@???>
> Subject: Re: [exim] How to specify Return-Path for ALL outbound e-mail that go through exim?
>
> > It's probably pointless to do this though since the delivering MTA
> > (not yours) is the one that's supposed to be adding it, so whatever you
> > put there is likely to be replaced or discarded. See Section 4.4 of
> > RFC5321.
>
> Not so. The "F" flag refers to the SMTP return-path, the MAIL FROM
> argument. I presumed that this is what the OP wanted.
That's the value that's used to generate the Return-Path header field's contents. That too can change as it transitions a gateway of some kind, especially since it's supposed to represent the sender's address relative to the recipient (e.g., with gateway routing information included). That's why it's only supposed to be added at delivery time.
