Re: [Exim] Remove sender from group expansion alias

> From: "Nigel Wade" <nmw@???>
>
> David S. Madole wrote:
> >>From: "Nigel Wade" <nmw@???>
> >>
> >>I am trying to tidy up a minor annoyance I have in my Exim setup. But so
> >
> > far
> >
> >>I've not been able to find any solution to the problem. I currently do
> >
> > group
> >
> >>expansion in aliases using an LDAP lookup in a redirect router. The
lookup
> >>is done using the data option, and returns a list of mail address which
> >
> > are
> >
> >>then redirected.
> >>
> >>Currently, if the sender is a member of the group, they receive a copy
of
> >>the message they sent. I'd like to be able to change this, and remove
the
> >>sender from the expanded list. Is there any way to do this within the
> >>redirect router?
> >
> >
> > I don't think there's an easy way to remove the sender from the list,
but
> > you could suppress the delivery.
> >
> > See the message below I sent a few days ago on the list on the same
topic.
> >
> > Simon did send me a reply that this approach worked for him.
> >
> > David
> >
> >
> > -----
> >
> >
> >>From: "David S. Madole" <david@???>
> >>
> >>>From: "Simon Fraser" <simonfr@???>
> >>>
> >>>As far as the documentation and posts here indicate, there's no
> >>>configuration option for turning off 'me too' posts resulting from
> >>>alias expansions.
> >>>
> >>>I've attempted to fake this ability using the data line I've included
> >>>below, but it seems a nasty way of doing it. It would be a lot
> >>>simpler if I could guarantee that the expanded addresses were all
> >>>qualified. As it is, it removes the entire sender_address if the
> >>>sender's domain is not the one that unqualified usernames get given,
> >>>and removes the local_part with an optional domain if it is.
> >>
> >>What if you put something like this before your other routers:
> >>
> >>absorb_me_too:
> >> condition = ${if eq{$sender_address}{$local_part@$domain}{if
> >>
> >
> >
eq{$original_local_part@$original_domain}{$local_part@$domain}{false}{true}}
> >
> >>}{false}}
> >> data = :blackhole:
> >>
> >>This is totally untested, you might need to tweak the brackets, and it
> >
> > might
> >
> >>not do what you want at all. Just an idea.
> >>
> >>Basically, if the sender and recipient are the same address and the
> >
> > address
> >
> >>is not the result of an expansion, discard the message.
> >>
> >>Also, have you looked at qualify_preserve_domain?
> >>
>
> I'll investigate something along these lines. I think my logic will be
> different, as I need to dispose of the message if the local_part *is* the
> result of an expansion (otherwise noone can ever send mail to themselves).
> I've not encountered $original_local_part before.


That's exactly what it is intended to do as written. The original_local_part
and original_domain contain the recipient address as it appeared before any
alias processing, so comparing it to the current recipient address tells you
if it was the result of expansion. If they are different, then an alias
expansion occurred. That's what I wrote.

There are a few other things that original_local_part and original_domain
reflect also that you might need to take into account, read the
specification for details.

David