Author: Patrick von der Hagen Date: To: konstantin@boyandin.info, exim-users@exim.org CC: Jeremy Harris Subject: Re: [exim] Exim 4.72: preventing backscatter
On 28.08.2014 01:55, Konstantin Boyandin wrote:
[...] > So currently I have 500 to 1000 of backscatter mail sitting in mail
> queue, since it can't be delivered to forged sender of spam sent to
> non-existing local addresses. Are there efficient ideas to reduce that
> number?
In my definition "backscatter" is about bounces with recipients that do
exist at your domain and that are able to recieve those bounces, when
those bounces result from emails that have not been sent from your
domain at all. Like a spammer needing a sender address and choosing an
existing one from your domain.
But according to that definition, how can those bounces end in your
queue? You should be able to deliver them, if the recipients exist or
you should not accept them in the first place.
I suspect you just don't do any recipient verification? I guess we are
talking about issues regarding your setup, but I doubt your problem is
"backscatter".
