Re: [exim] Callouts, NULL DSN

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Autor: Steve Brown
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A: Nigel Metheringham, exim-users
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Assumpte: Re: [exim] Callouts, NULL DSN
Okay, so why would one ever do a sender callout rather than just *always*
doing a header_sender callout?

And am I missing a FAQ somewhere that explains the finer details of
callouts?

Steve

>
> As an example think about this list.  The address <exim-users@???>
> is never ever used to send mail (mail going to you will instead have a
> sender address of <exim-users-bounces+...@exim.org>), so attempting a
> call out verify of the address will cause the following:-
>        MAIL FROM: <>
>        250 OK
>        RCPT TO: <exim-users@???>
>        550 "Recipient never sends mail so cannot cause bounces"

>
> If you are trying to do call out verification of this address then
> either:-
>     1. You received a forged message in the first place (so its not my
>        problem).
>     2. You are extracting addresses from headers (so thats your
>        problem).

>
> Nigel.